Rust analyzer showing non existent errors

[ZoutigeWolf]

Im developing a no_std project, but every IDE / text editor with Rust support is showing errors that don't actually exist.

Rust rover example

The errors dont appear in the editor and it builds just fine. But its really annoying since it marks all my filenames red.

I'm new to Rust and just wondering if anyone else has had this issue and if there is any way to fix it. If anyone requires more info about the project / config, im happy to provide.

[ShoyuVanilla]

Is your project public on the internet or could you share rust-analyzer output logs and your cargo configs(.cargo/config.toml) and rust-analyzer configs?

[ZoutigeWolf]

My .cargo dir has no config.toml file

This is rust-analyzer output when running VS Code

Language server output:

2025-11-13T14:36:07.268726+01:00 ERROR Received compiler message for unknown package: path+file:///Users/zouti/.rustup/toolchains/esp/lib/rustlib/src/rust/library/compiler-builtins/compiler-builtins#compiler_builtins@0.1.160
 registry+https://github.com/rust-lang/crates.io-index#serde_yaml@0.9.34+deprecated, registry+https://github.com/rust-lang/crates.io-index#hashbrown@0.16.0, registry+https://github.com/rust-lang/crates.io-index#stable_deref_trait@1.2.1, registry+https://github.com/rust-lang/crates.io-index#rlsf@0.2.1, registry+https://github.com/rust-lang/crates.io-index#heck@0.5.0, registry+https://github.com/rust-lang/crates.io-index#rustversion@1.0.22, registry+https://github.com/rust-lang/crates.io-index#digest@0.10.7, registry+https://github.com/rust-lang/crates.io-index#enumset_derive@0.14.0, registry+https://github.com/rust-lang/crates.io-index#quote@1.0.41, registry+https://github.com/rust-lang/crates.io-index#instability@0.3.9, registry+https://github.com/rust-lang/crates.io-index#fnv@1.0.7, registry+https://github.com/rust-lang/crates.io-index#ryu@1.0.20, registry+https://github.com/rust-lang/crates.io-index#somni-parser@0.2.2, registry+https://github.com/rust-lang/crates.io-index#darling_core@0.20.11, registry+https://github.com/rust-lang/crates.io-index#futures-task@0.3.31, registry+https://github.com/rust-lang/crates.io-index#ident_case@1.0.1, registry+https://github.com/rust-lang/crates.io-index#micromath@2.1.0, registry+https://github.com/rust-lang/crates.io-index#sha1@0.10.6, registry+https://github.com/rust-lang/crates.io-index#paste@1.0.15, registry+https://github.com/rust-lang/crates.io-index#bitflags@2.10.0, registry+https://github.com/rust-lang/crates.io-index#allocator-api2@0.3.1, registry+https://github.com/rust-lang/crates.io-index#generic-array@0.14.9, registry+https://github.com/rust-lang/crates.io-index#litrs@1.0.0, registry+https://github.com/rust-lang/crates.io-index#toml_datetime@0.7.3, registry+https://github.com/rust-lang/crates.io-index#xtensa-lx-rt@0.21.0, registry+https://github.com/rust-lang/crates.io-index#byteorder@1.5.0, registry+https://github.com/rust-lang/crates.io-index#linked_list_allocator@0.10.5, registry+https://github.com/rust-lang/crates.io-index#esp-hal@1.0.0, registry+https://github.com/rust-lang/crates.io-index#esp32s2@0.30.0, registry+https://github.com/rust-lang/crates.io-index#futures-sink@0.3.31, registry+https://github.com/rust-lang/crates.io-index#num-traits@0.2.19, registry+https://github.com/rust-lang/crates.io-index#unicode-ident@1.0.22, registry+https://github.com/rust-lang/crates.io-index#embassy-futures@0.1.2, registry+https://github.com/rust-lang/crates.io-index#equivalent@1.0.2, registry+https://github.com/rust-lang/crates.io-index#esp-alloc@0.9.0, registry+https://github.com/rust-lang/crates.io-index#bitfield@0.19.3, registry+https://github.com/rust-lang/crates.io-index#hash32@0.3.1, registry+https://github.com/rust-lang/crates.io-index#document-features@0.2.12, registry+https://github.com/rust-lang/crates.io-index#darling_macro@0.21.3, registry+https://github.com/rust-lang/crates.io-index#darling@0.21.3, registry+https://github.com/rust-lang/crates.io-index#esp32c2@0.28.0, registry+https://github.com/rust-lang/crates.io-index#sha2@0.10.9, registry+https://github.com/rust-lang/crates.io-index#crypto-common@0.1.6, registry+https://github.com/rust-lang/crates.io-index#embedded-storage@0.3.1, registry+https://github.com/rust-lang/crates.io-index#version_check@0.9.5, registry+https://github.com/rust-lang/crates.io-index#esp32c6@0.22.0, registry+https://github.com/rust-lang/crates.io-index#toml_edit@0.23.7, registry+https://github.com/rust-lang/crates.io-index#esp32c3@0.31.0, registry+https://github.com/rust-lang/crates.io-index#embedded-graphics@0.8.1, registry+https://github.com/rust-lang/crates.io-index#indexmap@2.12.0, registry+https://github.com/rust-lang/crates.io-index#unicode-width@0.1.14, registry+https://github.com/rust-lang/crates.io-index#embedded-io-async@0.6.1, registry+https://github.com/rust-lang/crates.io-index#autocfg@1.5.0, registry+https://github.com/rust-lang/crates.io-index#embassy-sync@0.6.2, registry+https://github.com/rust-lang/crates.io-index#bitfield-macros@0.19.3, registry+https://github.com/rust-lang/crates.io-index#futures-util@0.3.31, registry+https://github.com/rust-lang/crates.io-index#log@0.4.28, registry+https://github.com/rust-lang/crates.io-index#pin-utils@0.1.0, registry+https://github.com/rust-lang/crates.io-index#embassy-sync@0.7.2, registry+https://github.com/rust-lang/crates.io-index#svgbobdoc@0.3.0, registry+https://github.com/rust-lang/crates.io-index#unsafe-libyaml@0.2.11, registry+https://github.com/rust-lang/crates.io-index#syn@2.0.108, registry+https://github.com/rust-lang/crates.io-index#darling@0.20.11, registry+https://github.com/rust-lang/crates.io-index#serde_derive@1.0.228, registry+https://github.com/rust-lang/crates.io-index#embedded-hal-async@1.0.0, registry+https://github.com/rust-lang/crates.io-index#esp-metadata-generated@0.3.0, registry+https://github.com/rust-lang/crates.io-index#const-default@1.0.0, registry+https://github.com/rust-lang/crates.io-index#proc-macro-crate@3.4.0, registry+https://github.com/rust-lang/crates.io-index#itoa@1.0.15, registry+https://github.com/rust-lang/crates.io-index#delegate@0.13.4, registry+https://github.com/rust-lang/crates.io-index#bytemuck@1.24.0, registry+https://github.com/rust-lang/crates.io-index#esp-println@0.16.1, registry+https://github.com/rust-lang/crates.io-index#futures-core@0.3.31, registry+https://github.com/rust-lang/crates.io-index#strum@0.27.2, registry+https://github.com/rust-lang/crates.io-index#toml_parser@1.0.4, registry+https://github.com/rust-lang/crates.io-index#fugit@0.3.7, registry+https://github.com/rust-lang/crates.io-index#az@1.2.1, registry+https://github.com/rust-lang/crates.io-index#serde_core@1.0.228, registry+https://github.com/rust-lang/crates.io-index#serde@1.0.228, registry+https://github.com/rust-lang/crates.io-index#xtensa-lx-rt-proc-macros@0.5.0, registry+https://github.com/rust-lang/crates.io-index#esp32@0.39.0, registry+https://github.com/rust-lang/crates.io-index#gcd@2.3.0, registry+https://github.com/rust-lang/crates.io-index#strsim@0.11.1, registry+https://github.com/rust-lang/crates.io-index#strum_macros@0.27.2, registry+https://github.com/rust-lang/crates.io-index#termcolor@1.4.1, registry+https://github.com/rust-lang/crates.io-index#typenum@1.19.0, registry+https://github.com/rust-lang/crates.io-index#critical-section@1.2.0, registry+https://github.com/rust-lang/crates.io-index#esp-rom-sys@0.1.3, registry+https://github.com/rust-lang/crates.io-index#memchr@2.7.6, registry+https://github.com/rust-lang/crates.io-index#winnow@0.7.13, registry+https://github.com/rust-lang/crates.io-index#embedded-hal@1.0.0, registry+https://github.com/rust-lang/crates.io-index#jiff@0.2.15, registry+https://github.com/rust-lang/crates.io-index#embedded-io@0.6.1, registry+https://github.com/rust-lang/crates.io-index#proc-macro2@1.0.103, registry+https://github.com/rust-lang/crates.io-index#somni-expr@0.2.0, path+file:///Users/zouti/s40-hardware#0.1.0, registry+https://github.com/rust-lang/crates.io-index#esp-hal-procmacros@0.21.0, registry+https://github.com/rust-lang/crates.io-index#embedded-graphics-core@0.4.0, registry+https://github.com/rust-lang/crates.io-index#enumset@1.1.10, registry+https://github.com/rust-lang/crates.io-index#darling_core@0.21.3, registry+https://github.com/rust-lang/crates.io-index#esp-sync@0.1.1, registry+https://github.com/rust-lang/crates.io-index#float-cmp@0.9.0, registry+https://github.com/rust-lang/crates.io-index#block-buffer@0.10.4, registry+https://github.com/rust-lang/crates.io-index#esp-config@0.6.1, registry+https://github.com/rust-lang/crates.io-index#darling_macro@0.20.11, registry+https://github.com/rust-lang/crates.io-index#cfg-if@1.0.4, registry+https://github.com/rust-lang/crates.io-index#heapless@0.8.0, registry+https://github.com/rust-lang/crates.io-index#indoc@2.0.7, registry+https://github.com/rust-lang/crates.io-index#portable-atomic@1.11.1, registry+https://github.com/rust-lang/crates.io-index#esp32h2@0.18.0, registry+https://github.com/rust-lang/crates.io-index#vcell@0.1.3, registry+https://github.com/rust-lang/crates.io-index#xtensa-lx@0.13.0, registry+https://github.com/rust-lang/crates.io-index#esp32s3@0.34.0, registry+https://github.com/rust-lang/crates.io-index#base64@0.13.1, registry+https://github.com/rust-lang/crates.io-index#syn@1.0.109, registry+https://github.com/rust-lang/crates.io-index#esp-bootloader-esp-idf@0.4.0, registry+https://github.com/rust-lang/crates.io-index#pin-project-lite@0.2.16
2025-11-13T14:36:07.269072+01:00 ERROR Received compiler message for unknown package: path+file:///Users/zouti/.rustup/toolchains/esp/lib/rustlib/src/rust/library/compiler-builtins/compiler-builtins#compiler_builtins@0.1.160
 registry+https://github.com/rust-lang/crates.io-index#serde_yaml@0.9.34+deprecated, registry+https://github.com/rust-lang/crates.io-index#hashbrown@0.16.0, registry+https://github.com/rust-lang/crates.io-index#stable_deref_trait@1.2.1, registry+https://github.com/rust-lang/crates.io-index#rlsf@0.2.1, registry+https://github.com/rust-lang/crates.io-index#heck@0.5.0, registry+https://github.com/rust-lang/crates.io-index#rustversion@1.0.22, registry+https://github.com/rust-lang/crates.io-index#digest@0.10.7, registry+https://github.com/rust-lang/crates.io-index#enumset_derive@0.14.0, registry+https://github.com/rust-lang/crates.io-index#quote@1.0.41, registry+https://github.com/rust-lang/crates.io-index#instability@0.3.9, registry+https://github.com/rust-lang/crates.io-index#fnv@1.0.7, registry+https://github.com/rust-lang/crates.io-index#ryu@1.0.20, registry+https://github.com/rust-lang/crates.io-index#somni-parser@0.2.2, registry+https://github.com/rust-lang/crates.io-index#darling_core@0.20.11, registry+https://github.com/rust-lang/crates.io-index#futures-task@0.3.31, registry+https://github.com/rust-lang/crates.io-index#ident_case@1.0.1, registry+https://github.com/rust-lang/crates.io-index#micromath@2.1.0, registry+https://github.com/rust-lang/crates.io-index#sha1@0.10.6, registry+https://github.com/rust-lang/crates.io-index#paste@1.0.15, registry+https://github.com/rust-lang/crates.io-index#bitflags@2.10.0, registry+https://github.com/rust-lang/crates.io-index#allocator-api2@0.3.1, registry+https://github.com/rust-lang/crates.io-index#generic-array@0.14.9, registry+https://github.com/rust-lang/crates.io-index#litrs@1.0.0, registry+https://github.com/rust-lang/crates.io-index#toml_datetime@0.7.3, registry+https://github.com/rust-lang/crates.io-index#xtensa-lx-rt@0.21.0, registry+https://github.com/rust-lang/crates.io-index#byteorder@1.5.0, registry+https://github.com/rust-lang/crates.io-index#linked_list_allocator@0.10.5, registry+https://github.com/rust-lang/crates.io-index#esp-hal@1.0.0, registry+https://github.com/rust-lang/crates.io-index#esp32s2@0.30.0, registry+https://github.com/rust-lang/crates.io-index#futures-sink@0.3.31, registry+https://github.com/rust-lang/crates.io-index#num-traits@0.2.19, registry+https://github.com/rust-lang/crates.io-index#unicode-ident@1.0.22, registry+https://github.com/rust-lang/crates.io-index#embassy-futures@0.1.2, registry+https://github.com/rust-lang/crates.io-index#equivalent@1.0.2, registry+https://github.com/rust-lang/crates.io-index#esp-alloc@0.9.0, registry+https://github.com/rust-lang/crates.io-index#bitfield@0.19.3, registry+https://github.com/rust-lang/crates.io-index#hash32@0.3.1, registry+https://github.com/rust-lang/crates.io-index#document-features@0.2.12, registry+https://github.com/rust-lang/crates.io-index#darling_macro@0.21.3, registry+https://github.com/rust-lang/crates.io-index#darling@0.21.3, registry+https://github.com/rust-lang/crates.io-index#esp32c2@0.28.0, registry+https://github.com/rust-lang/crates.io-index#sha2@0.10.9, registry+https://github.com/rust-lang/crates.io-index#crypto-common@0.1.6, registry+https://github.com/rust-lang/crates.io-index#embedded-storage@0.3.1, registry+https://github.com/rust-lang/crates.io-index#version_check@0.9.5, registry+https://github.com/rust-lang/crates.io-index#esp32c6@0.22.0, registry+https://github.com/rust-lang/crates.io-index#toml_edit@0.23.7, registry+https://github.com/rust-lang/crates.io-index#esp32c3@0.31.0, registry+https://github.com/rust-lang/crates.io-index#embedded-graphics@0.8.1, registry+https://github.com/rust-lang/crates.io-index#indexmap@2.12.0, registry+https://github.com/rust-lang/crates.io-index#unicode-width@0.1.14, registry+https://github.com/rust-lang/crates.io-index#embedded-io-async@0.6.1, registry+https://github.com/rust-lang/crates.io-index#autocfg@1.5.0, registry+https://github.com/rust-lang/crates.io-index#embassy-sync@0.6.2, registry+https://github.com/rust-lang/crates.io-index#bitfield-macros@0.19.3, registry+https://github.com/rust-lang/crates.io-index#futures-util@0.3.31, registry+https://github.com/rust-lang/crates.io-index#log@0.4.28, registry+https://github.com/rust-lang/crates.io-index#pin-utils@0.1.0, registry+https://github.com/rust-lang/crates.io-index#embassy-sync@0.7.2, registry+https://github.com/rust-lang/crates.io-index#svgbobdoc@0.3.0, registry+https://github.com/rust-lang/crates.io-index#unsafe-libyaml@0.2.11, registry+https://github.com/rust-lang/crates.io-index#syn@2.0.108, registry+https://github.com/rust-lang/crates.io-index#darling@0.20.11, registry+https://github.com/rust-lang/crates.io-index#serde_derive@1.0.228, registry+https://github.com/rust-lang/crates.io-index#embedded-hal-async@1.0.0, registry+https://github.com/rust-lang/crates.io-index#esp-metadata-generated@0.3.0, registry+https://github.com/rust-lang/crates.io-index#const-default@1.0.0, registry+https://github.com/rust-lang/crates.io-index#proc-macro-crate@3.4.0, registry+https://github.com/rust-lang/crates.io-index#itoa@1.0.15, registry+https://github.com/rust-lang/crates.io-index#delegate@0.13.4, registry+https://github.com/rust-lang/crates.io-index#bytemuck@1.24.0, registry+https://github.com/rust-lang/crates.io-index#esp-println@0.16.1, registry+https://github.com/rust-lang/crates.io-index#futures-core@0.3.31, registry+https://github.com/rust-lang/crates.io-index#strum@0.27.2, registry+https://github.com/rust-lang/crates.io-index#toml_parser@1.0.4, registry+https://github.com/rust-lang/crates.io-index#fugit@0.3.7, registry+https://github.com/rust-lang/crates.io-index#az@1.2.1, registry+https://github.com/rust-lang/crates.io-index#serde_core@1.0.228, registry+https://github.com/rust-lang/crates.io-index#serde@1.0.228, registry+https://github.com/rust-lang/crates.io-index#xtensa-lx-rt-proc-macros@0.5.0, registry+https://github.com/rust-lang/crates.io-index#esp32@0.39.0, registry+https://github.com/rust-lang/crates.io-index#gcd@2.3.0, registry+https://github.com/rust-lang/crates.io-index#strsim@0.11.1, registry+https://github.com/rust-lang/crates.io-index#strum_macros@0.27.2, registry+https://github.com/rust-lang/crates.io-index#termcolor@1.4.1, registry+https://github.com/rust-lang/crates.io-index#typenum@1.19.0, registry+https://github.com/rust-lang/crates.io-index#critical-section@1.2.0, registry+https://github.com/rust-lang/crates.io-index#esp-rom-sys@0.1.3, registry+https://github.com/rust-lang/crates.io-index#memchr@2.7.6, registry+https://github.com/rust-lang/crates.io-index#winnow@0.7.13, registry+https://github.com/rust-lang/crates.io-index#embedded-hal@1.0.0, registry+https://github.com/rust-lang/crates.io-index#jiff@0.2.15, registry+https://github.com/rust-lang/crates.io-index#embedded-io@0.6.1, registry+https://github.com/rust-lang/crates.io-index#proc-macro2@1.0.103, registry+https://github.com/rust-lang/crates.io-index#somni-expr@0.2.0, path+file:///Users/zouti/s40-hardware#0.1.0, registry+https://github.com/rust-lang/crates.io-index#esp-hal-procmacros@0.21.0, registry+https://github.com/rust-lang/crates.io-index#embedded-graphics-core@0.4.0, registry+https://github.com/rust-lang/crates.io-index#enumset@1.1.10, registry+https://github.com/rust-lang/crates.io-index#darling_core@0.21.3, registry+https://github.com/rust-lang/crates.io-index#esp-sync@0.1.1, registry+https://github.com/rust-lang/crates.io-index#float-cmp@0.9.0, registry+https://github.com/rust-lang/crates.io-index#block-buffer@0.10.4, registry+https://github.com/rust-lang/crates.io-index#esp-config@0.6.1, registry+https://github.com/rust-lang/crates.io-index#darling_macro@0.20.11, registry+https://github.com/rust-lang/crates.io-index#cfg-if@1.0.4, registry+https://github.com/rust-lang/crates.io-index#heapless@0.8.0, registry+https://github.com/rust-lang/crates.io-index#indoc@2.0.7, registry+https://github.com/rust-lang/crates.io-index#portable-atomic@1.11.1, registry+https://github.com/rust-lang/crates.io-index#esp32h2@0.18.0, registry+https://github.com/rust-lang/crates.io-index#vcell@0.1.3, registry+https://github.com/rust-lang/crates.io-index#xtensa-lx@0.13.0, registry+https://github.com/rust-lang/crates.io-index#esp32s3@0.34.0, registry+https://github.com/rust-lang/crates.io-index#base64@0.13.1, registry+https://github.com/rust-lang/crates.io-index#syn@1.0.109, registry+https://github.com/rust-lang/crates.io-index#esp-bootloader-esp-idf@0.4.0, registry+https://github.com/rust-lang/crates.io-index#pin-project-lite@0.2.16
2025-11-13T14:36:12.575919+01:00  WARN overly long loop turn took 328.561167ms (event handling took 328.525375ms): PrimeCaches(End { cancelled: false })
2025-11-13T14:36:18.154399+01:00  WARN overly long loop turn took 249.887458ms (event handling took 65µs): Notification { method: "textDocument/didChange" }

rust-analyzer extension output:

2025-11-13 14:35:54.151 [info] Extension version: 0.3.2660
2025-11-13 14:35:54.151 [info] Using configuration {
  restartServerOnConfigChange: false,
  showUnlinkedFileNotification: true,
  showRequestFailedErrorNotification: true,
  showDependenciesExplorer: true,
  showSyntaxTree: false,
  testExplorer: false,
  initializeStopped: false,
  runnables: {
    extraEnv: null,
    problemMatcher: [ '$rustc' ],
    askBeforeUpdateTest: true,
    command: null,
    extraArgs: [],
    extraTestBinaryArgs: [ '--nocapture' ]
  },
  statusBar: {
    clickAction: 'openLogs',
    showStatusBar: {
      documentSelector: [
        { language: 'rust' },
        { pattern: '**/Cargo.toml' },
        { pattern: '**/Cargo.lock' },
        {
          scheme: 'output',
          pattern: 'extension-output-rust-lang.rust-analyzer*'
        }
      ]
    }
  },
  server: { path: null, extraEnv: null },
  trace: { server: 'off', extension: false },
  debug: {
    engine: 'auto',
    sourceFileMap: {
      '/rustc/<id>': '${env:USERPROFILE}/.rustup/toolchains/<toolchain-id>/lib/rustlib/src/rust'
    },
    buildBeforeRestart: false,
    engineSettings: {}
  },
  typing: { continueCommentsOnNewline: true, triggerChars: '=.' },
  diagnostics: {
    previewRustcOutput: false,
    useRustcErrorCode: false,
    disabled: [],
    enable: true,
    experimental: { enable: false },
    remapPrefix: {},
    styleLints: { enable: false },
    warningsAsHint: [],
    warningsAsInfo: []
  },
  assist: {
    emitMustUse: false,
    expressionFillDefault: 'todo',
    preferSelf: false,
    termSearch: { borrowcheck: true, fuel: 1800 }
  },
  cachePriming: { enable: true, numThreads: 'physical' },
  cargo: {
    allTargets: true,
    autoreload: true,
    buildScripts: {
      enable: true,
      invocationStrategy: 'per_workspace',
      overrideCommand: null,
      rebuildOnSave: true,
      useRustcWrapper: true
    },
    cfgs: [ 'debug_assertions', 'miri' ],
    extraArgs: [],
    extraEnv: {},
    features: [],
    noDefaultFeatures: false,
    noDeps: false,
    sysroot: 'discover',
    sysrootSrc: null,
    target: null,
    targetDir: null
  },
  cfg: { setTest: true },
  checkOnSave: true,
  check: {
    allTargets: null,
    command: 'check',
    extraArgs: [],
    extraEnv: {},
    features: null,
    ignore: [],
    invocationStrategy: 'per_workspace',
    noDefaultFeatures: null,
    overrideCommand: null,
    targets: null,
    workspace: true
  },
  completion: {
    addSemicolonToUnit: true,
    autoAwait: { enable: true },
    autoIter: { enable: true },
    autoimport: {
      enable: true,
      exclude: [
        { path: 'core::borrow::Borrow', type: 'methods' },
        { path: 'core::borrow::BorrowMut', type: 'methods' }
      ]
    },
    autoself: { enable: true },
    callable: { snippets: 'fill_arguments' },
    excludeTraits: [],
    fullFunctionSignatures: { enable: false },
    hideDeprecated: false,
    limit: null,
    postfix: { enable: true },
    privateEditable: { enable: false },
    snippets: {
      custom: {
        Ok: {
          postfix: 'ok',
          body: 'Ok(${receiver})',
          description: 'Wrap the expression in a `Result::Ok`',
          scope: 'expr'
        },
        'Box::pin': {
          postfix: 'pinbox',
          body: 'Box::pin(${receiver})',
          requires: 'std::boxed::Box',
          description: 'Put the expression into a pinned `Box`',
          scope: 'expr'
        },
        'Arc::new': {
          postfix: 'arc',
          body: 'Arc::new(${receiver})',
          requires: 'std::sync::Arc',
          description: 'Put the expression into an `Arc`',
          scope: 'expr'
        },
        Some: {
          postfix: 'some',
          body: 'Some(${receiver})',
          description: 'Wrap the expression in an `Option::Some`',
          scope: 'expr'
        },
        Err: {
          postfix: 'err',
          body: 'Err(${receiver})',
          description: 'Wrap the expression in a `Result::Err`',
          scope: 'expr'
        },
        'Rc::new': {
          postfix: 'rc',
          body: 'Rc::new(${receiver})',
          requires: 'std::rc::Rc',
          description: 'Put the expression into an `Rc`',
          scope: 'expr'
        }
      }
    },
    termSearch: { enable: false, fuel: 1000 }
  },
  document: { symbol: { search: { excludeLocals: true } } },
  files: { exclude: [], watcher: 'client' },
  highlightRelated: {
    branchExitPoints: { enable: true },
    breakPoints: { enable: true },
    closureCaptures: { enable: true },
    exitPoints: { enable: true },
    references: { enable: true },
    yieldPoints: { enable: true }
  },
  hover: {
    actions: {
      debug: { enable: true },
      enable: true,
      gotoTypeDef: { enable: true },
      implementations: { enable: true },
      references: { enable: false },
      run: { enable: true },
      updateTest: { enable: true }
    },
    documentation: { enable: true, keywords: { enable: true } },
    dropGlue: { enable: true },
    links: { enable: true },
    maxSubstitutionLength: 20,
    memoryLayout: {
      alignment: 'hexadecimal',
      enable: true,
      niches: false,
      offset: 'hexadecimal',
      padding: null,
      size: 'both'
    },
    show: { enumVariants: 5, fields: 5, traitAssocItems: null }
  },
  imports: {
    granularity: { enforce: false, group: 'crate' },
    group: { enable: true },
    merge: { glob: true },
    preferNoStd: false,
    preferPrelude: false,
    prefix: 'crate',
    prefixExternPrelude: false
  },
  inlayHints: {
    bindingModeHints: { enable: true },
    chainingHints: { enable: true },
    closingBraceHints: { enable: true, minLines: 25 },
    closureCaptureHints: { enable: true },
    closureReturnTypeHints: { enable: 'always' },
    closureStyle: 'impl_fn',
    discriminantHints: { enable: 'always' },
    expressionAdjustmentHints: {
      disableReborrows: true,
      enable: 'never',
      hideOutsideUnsafe: false,
      mode: 'prefix'
    },
    genericParameterHints: {
      const: { enable: true },
      lifetime: { enable: true },
      type: { enable: true }
    },
    implicitDrops: { enable: true },
    implicitSizedBoundHints: { enable: true },
    lifetimeElisionHints: { enable: 'never', useParameterNames: false },
    maxLength: 25,
    parameterHints: { enable: true },
    rangeExclusiveHints: { enable: true },
    reborrowHints: { enable: 'always' },
    renderColons: true,
    typeHints: {
      enable: true,
      hideClosureInitialization: false,
      hideClosureParameter: false,
      hideNamedConstructor: false
    }
  },
  interpret: { tests: false },
  joinLines: {
    joinAssignments: true,
    joinElseIf: true,
    removeTrailingComma: true,
    unwrapTrivialBlock: true
  },
  lens: {
    debug: { enable: true },
    enable: true,
    implementations: { enable: true },
    location: 'above_name',
    references: {
      adt: { enable: false },
      enumVariant: { enable: false },
      method: { enable: false },
      trait: { enable: false }
    },
    run: { enable: true },
    updateTest: { enable: true }
  },
  linkedProjects: [],
  lru: { capacity: null, query: { capacities: {} } },
  notifications: { cargoTomlNotFound: true },
  numThreads: null,
  procMacro: {
    attributes: { enable: true },
    enable: true,
    ignored: {},
    server: null
  },
  references: { excludeImports: false, excludeTests: false },
  rustc: { source: null },
  rustfmt: {
    extraArgs: [],
    overrideCommand: null,
    rangeFormatting: { enable: false }
  },
  semanticHighlighting: {
    comments: { enable: true },
    doc: { comment: { inject: { enable: true } } },
    nonStandardTokens: true,
    operator: { enable: true, specialization: { enable: false } },
    punctuation: {
      enable: false,
      separate: { macro: { bang: false } },
      specialization: { enable: false }
    },
    strings: { enable: true }
  },
  signatureInfo: { detail: 'full', documentation: { enable: true } },
  vfs: { extraIncludes: [] },
  workspace: {
    discoverConfig: null,
    symbol: {
      search: {
        excludeImports: false,
        kind: 'only_types',
        limit: 128,
        scope: 'workspace'
      }
    }
  }
}
2025-11-13 14:35:54.151 [info] PersistentState: { serverVersion: undefined }
2025-11-13 14:35:54.151 [info] Starting language client
2025-11-13 14:35:54.151 [info] Using server binary at /Users/zouti/.vscode/extensions/rust-lang.rust-analyzer-0.3.2660-darwin-arm64/server/rust-analyzer
2025-11-13 14:35:56.466 [info] /Users/zouti/.vscode/extensions/rust-lang.rust-analyzer-0.3.2660-darwin-arm64/server/rust-analyzer --version: {
  stdout: 'rust-analyzer 0.3.2660-standalone (7c810e9994 2025-10-27)\n',
  stderr: '',
  status: 0
}
2025-11-13 14:36:03.463 [info] Extension version: 0.3.2660
2025-11-13 14:36:03.464 [info] Using configuration {
  restartServerOnConfigChange: false,
  showUnlinkedFileNotification: true,
  showRequestFailedErrorNotification: true,
  showDependenciesExplorer: true,
  showSyntaxTree: false,
  testExplorer: false,
  initializeStopped: false,
  runnables: {
    extraEnv: null,
    problemMatcher: [ '$rustc' ],
    askBeforeUpdateTest: true,
    command: null,
    extraArgs: [],
    extraTestBinaryArgs: [ '--nocapture' ]
  },
  statusBar: {
    clickAction: 'openLogs',
    showStatusBar: {
      documentSelector: [
        { language: 'rust' },
        { pattern: '**/Cargo.toml' },
        { pattern: '**/Cargo.lock' },
        {
          scheme: 'output',
          pattern: 'extension-output-rust-lang.rust-analyzer*'
        }
      ]
    }
  },
  server: { path: null, extraEnv: null },
  trace: { server: 'off', extension: false },
  debug: {
    engine: 'auto',
    sourceFileMap: {
      '/rustc/<id>': '${env:USERPROFILE}/.rustup/toolchains/<toolchain-id>/lib/rustlib/src/rust'
    },
    buildBeforeRestart: false,
    engineSettings: {}
  },
  typing: { continueCommentsOnNewline: true, triggerChars: '=.' },
  diagnostics: {
    previewRustcOutput: false,
    useRustcErrorCode: false,
    disabled: [],
    enable: true,
    experimental: { enable: false },
    remapPrefix: {},
    styleLints: { enable: false },
    warningsAsHint: [],
    warningsAsInfo: []
  },
  assist: {
    emitMustUse: false,
    expressionFillDefault: 'todo',
    preferSelf: false,
    termSearch: { borrowcheck: true, fuel: 1800 }
  },
  cachePriming: { enable: true, numThreads: 'physical' },
  cargo: {
    allTargets: true,
    autoreload: true,
    buildScripts: {
      enable: true,
      invocationStrategy: 'per_workspace',
      overrideCommand: null,
      rebuildOnSave: true,
      useRustcWrapper: true
    },
    cfgs: [ 'debug_assertions', 'miri' ],
    extraArgs: [],
    extraEnv: {},
    features: [],
    noDefaultFeatures: false,
    noDeps: false,
    sysroot: 'discover',
    sysrootSrc: null,
    target: null,
    targetDir: null
  },
  cfg: { setTest: true },
  checkOnSave: true,
  check: {
    allTargets: null,
    command: 'check',
    extraArgs: [],
    extraEnv: {},
    features: null,
    ignore: [],
    invocationStrategy: 'per_workspace',
    noDefaultFeatures: null,
    overrideCommand: null,
    targets: null,
    workspace: true
  },
  completion: {
    addSemicolonToUnit: true,
    autoAwait: { enable: true },
    autoIter: { enable: true },
    autoimport: {
      enable: true,
      exclude: [
        { path: 'core::borrow::Borrow', type: 'methods' },
        { path: 'core::borrow::BorrowMut', type: 'methods' }
      ]
    },
    autoself: { enable: true },
    callable: { snippets: 'fill_arguments' },
    excludeTraits: [],
    fullFunctionSignatures: { enable: false },
    hideDeprecated: false,
    limit: null,
    postfix: { enable: true },
    privateEditable: { enable: false },
    snippets: {
      custom: {
        Ok: {
          postfix: 'ok',
          body: 'Ok(${receiver})',
          description: 'Wrap the expression in a `Result::Ok`',
          scope: 'expr'
        },
        'Box::pin': {
          postfix: 'pinbox',
          body: 'Box::pin(${receiver})',
          requires: 'std::boxed::Box',
          description: 'Put the expression into a pinned `Box`',
          scope: 'expr'
        },
        'Arc::new': {
          postfix: 'arc',
          body: 'Arc::new(${receiver})',
          requires: 'std::sync::Arc',
          description: 'Put the expression into an `Arc`',
          scope: 'expr'
        },
        Some: {
          postfix: 'some',
          body: 'Some(${receiver})',
          description: 'Wrap the expression in an `Option::Some`',
          scope: 'expr'
        },
        Err: {
          postfix: 'err',
          body: 'Err(${receiver})',
          description: 'Wrap the expression in a `Result::Err`',
          scope: 'expr'
        },
        'Rc::new': {
          postfix: 'rc',
          body: 'Rc::new(${receiver})',
          requires: 'std::rc::Rc',
          description: 'Put the expression into an `Rc`',
          scope: 'expr'
        }
      }
    },
    termSearch: { enable: false, fuel: 1000 }
  },
  document: { symbol: { search: { excludeLocals: true } } },
  files: { exclude: [], watcher: 'client' },
  highlightRelated: {
    branchExitPoints: { enable: true },
    breakPoints: { enable: true },
    closureCaptures: { enable: true },
    exitPoints: { enable: true },
    references: { enable: true },
    yieldPoints: { enable: true }
  },
  hover: {
    actions: {
      debug: { enable: true },
      enable: true,
      gotoTypeDef: { enable: true },
      implementations: { enable: true },
      references: { enable: false },
      run: { enable: true },
      updateTest: { enable: true }
    },
    documentation: { enable: true, keywords: { enable: true } },
    dropGlue: { enable: true },
    links: { enable: true },
    maxSubstitutionLength: 20,
    memoryLayout: {
      alignment: 'hexadecimal',
      enable: true,
      niches: false,
      offset: 'hexadecimal',
      padding: null,
      size: 'both'
    },
    show: { enumVariants: 5, fields: 5, traitAssocItems: null }
  },
  imports: {
    granularity: { enforce: false, group: 'crate' },
    group: { enable: true },
    merge: { glob: true },
    preferNoStd: false,
    preferPrelude: false,
    prefix: 'crate',
    prefixExternPrelude: false
  },
  inlayHints: {
    bindingModeHints: { enable: true },
    chainingHints: { enable: true },
    closingBraceHints: { enable: true, minLines: 25 },
    closureCaptureHints: { enable: true },
    closureReturnTypeHints: { enable: 'always' },
    closureStyle: 'impl_fn',
    discriminantHints: { enable: 'always' },
    expressionAdjustmentHints: {
      disableReborrows: true,
      enable: 'never',
      hideOutsideUnsafe: false,
      mode: 'prefix'
    },
    genericParameterHints: {
      const: { enable: true },
      lifetime: { enable: true },
      type: { enable: true }
    },
    implicitDrops: { enable: true },
    implicitSizedBoundHints: { enable: true },
    lifetimeElisionHints: { enable: 'never', useParameterNames: false },
    maxLength: 25,
    parameterHints: { enable: true },
    rangeExclusiveHints: { enable: true },
    reborrowHints: { enable: 'always' },
    renderColons: true,
    typeHints: {
      enable: true,
      hideClosureInitialization: false,
      hideClosureParameter: false,
      hideNamedConstructor: false
    }
  },
  interpret: { tests: false },
  joinLines: {
    joinAssignments: true,
    joinElseIf: true,
    removeTrailingComma: true,
    unwrapTrivialBlock: true
  },
  lens: {
    debug: { enable: true },
    enable: true,
    implementations: { enable: true },
    location: 'above_name',
    references: {
      adt: { enable: false },
      enumVariant: { enable: false },
      method: { enable: false },
      trait: { enable: false }
    },
    run: { enable: true },
    updateTest: { enable: true }
  },
  linkedProjects: [],
  lru: { capacity: null, query: { capacities: {} } },
  notifications: { cargoTomlNotFound: true },
  numThreads: null,
  procMacro: {
    attributes: { enable: true },
    enable: true,
    ignored: {},
    server: null
  },
  references: { excludeImports: false, excludeTests: false },
  rustc: { source: null },
  rustfmt: {
    extraArgs: [],
    overrideCommand: null,
    rangeFormatting: { enable: false }
  },
  semanticHighlighting: {
    comments: { enable: true },
    doc: { comment: { inject: { enable: true } } },
    nonStandardTokens: true,
    operator: { enable: true, specialization: { enable: false } },
    punctuation: {
      enable: false,
      separate: { macro: { bang: false } },
      specialization: { enable: false }
    },
    strings: { enable: true }
  },
  signatureInfo: { detail: 'full', documentation: { enable: true } },
  vfs: { extraIncludes: [] },
  workspace: {
    discoverConfig: null,
    symbol: {
      search: {
        excludeImports: false,
        kind: 'only_types',
        limit: 128,
        scope: 'workspace'
      }
    }
  }
}
2025-11-13 14:36:03.464 [info] PersistentState: { serverVersion: undefined }
2025-11-13 14:36:03.464 [info] Starting language client
2025-11-13 14:36:03.464 [info] Extension version: 0.3.2660
2025-11-13 14:36:03.464 [info] Using configuration {
  restartServerOnConfigChange: false,
  showUnlinkedFileNotification: true,
  showRequestFailedErrorNotification: true,
  showDependenciesExplorer: true,
  showSyntaxTree: false,
  testExplorer: false,
  initializeStopped: false,
  runnables: {
    extraEnv: null,
    problemMatcher: [ '$rustc' ],
    askBeforeUpdateTest: true,
    command: null,
    extraArgs: [],
    extraTestBinaryArgs: [ '--nocapture' ]
  },
  statusBar: {
    clickAction: 'openLogs',
    showStatusBar: {
      documentSelector: [
        { language: 'rust' },
        { pattern: '**/Cargo.toml' },
        { pattern: '**/Cargo.lock' },
        {
          scheme: 'output',
          pattern: 'extension-output-rust-lang.rust-analyzer*'
        }
      ]
    }
  },
  server: { path: null, extraEnv: null },
  trace: { server: 'off', extension: false },
  debug: {
    engine: 'auto',
    sourceFileMap: {
      '/rustc/<id>': '${env:USERPROFILE}/.rustup/toolchains/<toolchain-id>/lib/rustlib/src/rust'
    },
    buildBeforeRestart: false,
    engineSettings: {}
  },
  typing: { continueCommentsOnNewline: true, triggerChars: '=.' },
  diagnostics: {
    previewRustcOutput: false,
    useRustcErrorCode: false,
    disabled: [],
    enable: true,
    experimental: { enable: false },
    remapPrefix: {},
    styleLints: { enable: false },
    warningsAsHint: [],
    warningsAsInfo: []
  },
  assist: {
    emitMustUse: false,
    expressionFillDefault: 'todo',
    preferSelf: false,
    termSearch: { borrowcheck: true, fuel: 1800 }
  },
  cachePriming: { enable: true, numThreads: 'physical' },
  cargo: {
    allTargets: true,
    autoreload: true,
    buildScripts: {
      enable: true,
      invocationStrategy: 'per_workspace',
      overrideCommand: null,
      rebuildOnSave: true,
      useRustcWrapper: true
    },
    cfgs: [ 'debug_assertions', 'miri' ],
    extraArgs: [],
    extraEnv: {},
    features: [],
    noDefaultFeatures: false,
    noDeps: false,
    sysroot: 'discover',
    sysrootSrc: null,
    target: null,
    targetDir: null
  },
  cfg: { setTest: true },
  checkOnSave: true,
  check: {
    allTargets: null,
    command: 'check',
    extraArgs: [],
    extraEnv: {},
    features: null,
    ignore: [],
    invocationStrategy: 'per_workspace',
    noDefaultFeatures: null,
    overrideCommand: null,
    targets: null,
    workspace: true
  },
  completion: {
    addSemicolonToUnit: true,
    autoAwait: { enable: true },
    autoIter: { enable: true },
    autoimport: {
      enable: true,
      exclude: [
        { path: 'core::borrow::Borrow', type: 'methods' },
        { path: 'core::borrow::BorrowMut', type: 'methods' }
      ]
    },
    autoself: { enable: true },
    callable: { snippets: 'fill_arguments' },
    excludeTraits: [],
    fullFunctionSignatures: { enable: false },
    hideDeprecated: false,
    limit: null,
    postfix: { enable: true },
    privateEditable: { enable: false },
    snippets: {
      custom: {
        Ok: {
          postfix: 'ok',
          body: 'Ok(${receiver})',
          description: 'Wrap the expression in a `Result::Ok`',
          scope: 'expr'
        },
        'Box::pin': {
          postfix: 'pinbox',
          body: 'Box::pin(${receiver})',
          requires: 'std::boxed::Box',
          description: 'Put the expression into a pinned `Box`',
          scope: 'expr'
        },
        'Arc::new': {
          postfix: 'arc',
          body: 'Arc::new(${receiver})',
          requires: 'std::sync::Arc',
          description: 'Put the expression into an `Arc`',
          scope: 'expr'
        },
        Some: {
          postfix: 'some',
          body: 'Some(${receiver})',
          description: 'Wrap the expression in an `Option::Some`',
          scope: 'expr'
        },
        Err: {
          postfix: 'err',
          body: 'Err(${receiver})',
          description: 'Wrap the expression in a `Result::Err`',
          scope: 'expr'
        },
        'Rc::new': {
          postfix: 'rc',
          body: 'Rc::new(${receiver})',
          requires: 'std::rc::Rc',
          description: 'Put the expression into an `Rc`',
          scope: 'expr'
        }
      }
    },
    termSearch: { enable: false, fuel: 1000 }
  },
  document: { symbol: { search: { excludeLocals: true } } },
  files: { exclude: [], watcher: 'client' },
  highlightRelated: {
    branchExitPoints: { enable: true },
    breakPoints: { enable: true },
    closureCaptures: { enable: true },
    exitPoints: { enable: true },
    references: { enable: true },
    yieldPoints: { enable: true }
  },
  hover: {
    actions: {
      debug: { enable: true },
      enable: true,
      gotoTypeDef: { enable: true },
      implementations: { enable: true },
      references: { enable: false },
      run: { enable: true },
      updateTest: { enable: true }
    },
    documentation: { enable: true, keywords: { enable: true } },
    dropGlue: { enable: true },
    links: { enable: true },
    maxSubstitutionLength: 20,
    memoryLayout: {
      alignment: 'hexadecimal',
      enable: true,
      niches: false,
      offset: 'hexadecimal',
      padding: null,
      size: 'both'
    },
    show: { enumVariants: 5, fields: 5, traitAssocItems: null }
  },
  imports: {
    granularity: { enforce: false, group: 'crate' },
    group: { enable: true },
    merge: { glob: true },
    preferNoStd: false,
    preferPrelude: false,
    prefix: 'crate',
    prefixExternPrelude: false
  },
  inlayHints: {
    bindingModeHints: { enable: true },
    chainingHints: { enable: true },
    closingBraceHints: { enable: true, minLines: 25 },
    closureCaptureHints: { enable: true },
    closureReturnTypeHints: { enable: 'always' },
    closureStyle: 'impl_fn',
    discriminantHints: { enable: 'always' },
    expressionAdjustmentHints: {
      disableReborrows: true,
      enable: 'never',
      hideOutsideUnsafe: false,
      mode: 'prefix'
    },
    genericParameterHints: {
      const: { enable: true },
      lifetime: { enable: true },
      type: { enable: true }
    },
    implicitDrops: { enable: true },
    implicitSizedBoundHints: { enable: true },
    lifetimeElisionHints: { enable: 'never', useParameterNames: false },
    maxLength: 25,
    parameterHints: { enable: true },
    rangeExclusiveHints: { enable: true },
    reborrowHints: { enable: 'always' },
    renderColons: true,
    typeHints: {
      enable: true,
      hideClosureInitialization: false,
      hideClosureParameter: false,
      hideNamedConstructor: false
    }
  },
  interpret: { tests: false },
  joinLines: {
    joinAssignments: true,
    joinElseIf: true,
    removeTrailingComma: true,
    unwrapTrivialBlock: true
  },
  lens: {
    debug: { enable: true },
    enable: true,
    implementations: { enable: true },
    location: 'above_name',
    references: {
      adt: { enable: false },
      enumVariant: { enable: false },
      method: { enable: false },
      trait: { enable: false }
    },
    run: { enable: true },
    updateTest: { enable: true }
  },
  linkedProjects: [],
  lru: { capacity: null, query: { capacities: {} } },
  notifications: { cargoTomlNotFound: true },
  numThreads: null,
  procMacro: {
    attributes: { enable: true },
    enable: true,
    ignored: {},
    server: null
  },
  references: { excludeImports: false, excludeTests: false },
  rustc: { source: null },
  rustfmt: {
    extraArgs: [],
    overrideCommand: null,
    rangeFormatting: { enable: false }
  },
  semanticHighlighting: {
    comments: { enable: true },
    doc: { comment: { inject: { enable: true } } },
    nonStandardTokens: true,
    operator: { enable: true, specialization: { enable: false } },
    punctuation: {
      enable: false,
      separate: { macro: { bang: false } },
      specialization: { enable: false }
    },
    strings: { enable: true }
  },
  signatureInfo: { detail: 'full', documentation: { enable: true } },
  vfs: { extraIncludes: [] },
  workspace: {
    discoverConfig: null,
    symbol: {
      search: {
        excludeImports: false,
        kind: 'only_types',
        limit: 128,
        scope: 'workspace'
      }
    }
  }
}
2025-11-13 14:36:03.630 [info] Using server binary at /Users/zouti/.vscode/extensions/rust-lang.rust-analyzer-0.3.2660-darwin-arm64/server/rust-analyzer
2025-11-13 14:36:03.643 [info] /Users/zouti/.vscode/extensions/rust-lang.rust-analyzer-0.3.2660-darwin-arm64/server/rust-analyzer --version: {
  stdout: 'rust-analyzer 0.3.2660-standalone (7c810e9994 2025-10-27)\n',
  stderr: '',
  status: 0
}

[ShoyuVanilla]

Seems like a similar issue with #20813

[ZoutigeWolf]

Managed to find the cargo config

[target.xtensa-esp32-none-elf]
runner = "espflash flash --monitor --chip esp32 --baud 921600"

[env]

[build]
rustflags = [
  "-C", "link-arg=-nostartfiles",
]

target = "xtensa-esp32-none-elf"

[unstable]
build-std = ["alloc", "core"]

tried setting the target for rust-analyzer in settings.json but no success

[ShoyuVanilla]

BTW, RustRover and IntelliJ Rust Plugin are different things from rust-analyzer. Are you having the same problem with rust-analyzer?

[ZoutigeWolf]

When i use another editor that uses rust-analyzer the same thing happens

[ShoyuVanilla]

Could you let me know your environments like editor, rust-analyzer version and rust toolchain version and could you share your project if possible?

[ZoutigeWolf]

i put everything here: https://github.com/ZoutigeWolf/s40-hardware

VS Code
rust-analyzer 0.3.2660-standalone (7c810e9994 2025-10-27)

[ShoyuVanilla]

Thanks! I'll look into it!

[ZoutigeWolf]

Thank you!

[ZoutigeWolf]

@ShoyuVanilla Apparently all errors happened because my code was located in src/bin/, moving all files to just src/ fixed all errors.

[ShoyuVanilla]

That's great. But since the previous project structure built well I'll check whether that is a bug in rust-analyzer anyway 😅

[ZoutigeWolf]

I dont think its a bug.

The build still worked because my target points to main.rs, which includes the submodules via mod.
In this case the main.rs is treated as the binary and the other files as submodules.
But because all files are in the /bin dir, rust / rust-analyzer sees them as different targets, because they should be.
So rust-analyzer was doing the right thing showing those errors.

[[bin]]
name = "s40-hardware"
path = "./src/bin/main.rs"

it will only fail when running just cargo build without specifying a target. It will build all files in the /bin dir separately as separate binaries, which will cause build errors.