mGCA: Make trait object types with type-level associated consts dyn compatible#150843

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fmease wants to merge 11 commits intorust-lang:mainfrom

Commits on Jan 21, 2026

mGCA: Make traits with type assoc consts dyn compatible...
fmease
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Fix v0 symbol mangling for assoc const bindings
fmease
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mGCA: Permit certain const projections in dyn-compatible traits
fmease
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Generalize diag for missing assoc types to account for assoc consts
fmease
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Generalize diag for conflicting assoc type bindings to account for assoc consts
fmease
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Introduce `AssocTag::descr` & refactor in the vicinity
fmease
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Fix handling of const params defaults that ref `Self` & generalize diag
fmease
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mGCA: Force users to specify type assoc consts from supertraits that would otherwise ref `Self`
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Reject const projections behind trait aliases that mention `Self`
fmease
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mGCA: Render traits dyn incompatible if the ty of an assoc const refs `Self` (barring `Self` projections)
fmease
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Support debuginfo for assoc const bindings
fmease
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