Dana Jansens 4416f3525b Canonicalize generated functions for Core witnesses (#7729) ...

Use a single `SemIR::Function` per `Core` interface method, whether it's
generated locally or imported. This prevents generating duplicate
functions, which lead to different types when the witness appears in a
`FacetValue` as part of a specific for a class.

We use a `CanonicalValueStore` of `GeneratedFunction` objects that allow
finding an existing FunctionId for a `Generated` special function before
(re-)generating it. Mangling for `Generated` functions is also moved to
use the values from the `GeneratedFunction`'s canonicalization key, so
that we have a consistent source of truth for the unique ID of a
`Generated` function across all files.

New tests are in
`toolchain/check/testdata/impl/custom_witness/destroy.carbon`.

2026-09-15 16:02:13 +00:00

..

destroy.carbon

Canonicalize generated functions for Core witnesses (#7729)

2026-09-15 16:02:13 +00:00

float_fits_in.carbon

Replace :! binding syntax with phase keywords and contextual defaults (#7479)

2026-07-11 01:22:44 +00:00

int_fits_in.carbon

Replace :! binding syntax with phase keywords and contextual defaults (#7479)

2026-07-11 01:22:44 +00:00