Move linting config to Cargo.toml and only warn

This reworks the rustc, Clippy, and rustdoc linting configuration to the
Cargo.toml file, and converts all denied lints to be warnings.

Cargo.toml

@@ -20,3 +20,91 @@ edition = "2018"
 
 [lib]
 name = "captur"
+
+[lints.rust]
+future_incompatible = { level = "warn", priority = -2 }
+keyword_idents = { level = "warn", priority = -3 }
+let_underscore = { level = "warn", priority = -2 }
+nonstandard_style = { level = "warn", priority = -2 }
+# refiing_impl_trait - Not needed for this project
+rust_2018_compatibility = { level = "warn", priority = -2 }
+rust_2018_idioms = { level = "warn", priority = -2 }
+rust_2021_compatibility = { level = "warn", priority = -2 }
+rust_2024_compatibility = { level = "warn", priority = -2 }
+unused = { level = "warn", priority = -2 }
+
+unknown_lints = { level = "warn", priority = -1 }
+renamed_and_removed_lints = { level = "warn", priority = -1 }
+
+# Allow certain configs in the check-cfg linting
+unexpected_cfgs = { level = "warn", check-cfg = ["cfg(tarpaulin_include)"] }
+
+# absolute_paths_not_starting_with_crate - group rust_2018_compatibility
+# box-pointers - no reason to disallow this in project
+deprecated_in_future = "warn"
+# elided_lifetimes_in_paths - group: rust_2018_idioms
+# explicit_outlives_requirements - group: rust_2018_idioms
+ffi_unwind_calls = "warn"
+# fuzzy_provenance_casts - unstable
+# impl_trait_overcaptures - unstable
+# keyword_idents_2018 - group: rust_2018_compatibility
+# keyword_idents_2024 - group: rust_2024_compatibility
+# let_underscore_drop - group: let_underscore
+# lossy_provenance_casts - unstable
+macro_use_extern_crate = "warn"
+meta_variable_misuse = "warn"
+missing_abi = "warn"
+missing_copy_implementations = "warn"
+missing_debug_implementations = "warn"
+# missing_docs - not requiring docs in this project
+# multiple_supertrait_upcastable - unstable
+# must_not_suspend - unstable
+non_ascii_idents = "warn"
+# non_exhaustive_omitted_patterns - unstable
+redundant_lifetimes = "warn"
+# rust_2021_incompatible_closure_captures - group: rust_2021_compatibility
+# rust_2021_incompatible_or_patterns - group: rust_2021_compatibility
+# rust_2021_prefixes_incompatible_syntax - group: rust_2021_compatibility
+# rust_2021_prelude_collisions - group: rust_2021_compatibility
+# rust_2024_incompatible_pat - unstable
+single_use_lifetimes = "warn"
+trivial_casts = "warn"
+trivial_numeric_casts = "warn"
+unit-bindings = "warn"
+unnameable_types = "warn"
+unreachable_pub = "warn"
+unsafe_code = "warn"
+# unsafe_op_in_unsafe_fn - group: rust_2024_compatibility
+# unstable_features - deprecated
+unused_crate_dependencies = "warn"
+# unused_extern_crates - group: unused, rust_2018_idioms
+unused_import_braces = "warn"
+unused_lifetimes = "warn"
+# unused_macro_rules - group: unused
+unused_qualifications = "warn"
+unused_results = "warn"
+variant_size_differences = "warn"
+
+[lints.clippy]
+all = { level = "warn", priority = -2 }
+cargo = { level = "warn", priority = -2 }
+pedantic = { level = "warn", priority = -2 }
+restriction = { level = "warn", priority = -2 }
+
+# Clippy restricts enabling restricted lints
+blanket_clippy_restriction_lints = { level = "allow", priority = 5 }
+
+implicit_return = "allow"
+min_ident_chars = "allow"
+missing_docs_in_private_items = "allow"
+redundant_pub_crate = "allow"
+tabs_in_doc_comments = "allow"
+
+[lints.rustdoc]
+bare_urls = "warn"
+broken_intra_doc_links = "warn"
+invalid_codeblock_attributes = "warn"
+invalid_html_tags = "warn"
+missing_crate_level_docs = "allow"
+private_doc_tests = "warn"
+private_intra_doc_links = "warn"

src/lib.rs

@@ -1,63 +1,3 @@
-#![deny(
-	future_incompatible,
-	nonstandard_style,
-	rust_2018_compatibility,
-	rust_2018_idioms,
-	unused,
-	warnings
-)]
-// rustc's additional allowed by default lints
-#![deny(
-	absolute_paths_not_starting_with_crate,
-	deprecated_in_future,
-	elided_lifetimes_in_paths,
-	explicit_outlives_requirements,
-	keyword_idents,
-	macro_use_extern_crate,
-	meta_variable_misuse,
-	missing_abi,
-	missing_copy_implementations,
-	missing_debug_implementations,
-	missing_docs,
-	non_ascii_idents,
-	noop_method_call,
-	or_patterns_back_compat,
-	pointer_structural_match,
-	semicolon_in_expressions_from_macros,
-	single_use_lifetimes,
-	trivial_casts,
-	trivial_numeric_casts,
-	unreachable_pub,
-	unsafe_code,
-	unsafe_op_in_unsafe_fn,
-	unstable_features,
-	unused_crate_dependencies,
-	unused_extern_crates,
-	unused_import_braces,
-	unused_lifetimes,
-	unused_qualifications,
-	unused_results,
-	variant_size_differences
-)]
-// enable all of Clippy's lints
-#![deny(clippy::all, clippy::cargo, clippy::nursery, clippy::pedantic, clippy::restriction)]
-#![allow(
-	clippy::blanket_clippy_restriction_lints,
-	clippy::implicit_return,
-	clippy::missing_docs_in_private_items,
-	clippy::redundant_pub_crate,
-	clippy::tabs_in_doc_comments
-)]
-#![deny(
-	rustdoc::bare_urls,
-	rustdoc::broken_intra_doc_links,
-	rustdoc::invalid_codeblock_attributes,
-	rustdoc::invalid_html_tags,
-	rustdoc::missing_crate_level_docs,
-	rustdoc::private_doc_tests,
-	rustdoc::private_intra_doc_links
-)]
-
 //! # Captur
 //!
 //! Starting in Rust 2021, Rust will no longer capture whole structs and instead will only capture a