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T

Dana Jansens ad4914b575 Avoid deducing errors as argument instructions after subst (#5710 )

If convert fails after applying a substitution in deduce, fail deduction
rather than succeeding deduction with an ErrorInst in the deduced
argument.

For example, in
`toolchain/check/testdata/facet/fail_convert_class_type_to_generic_facet_value.carbon`
the `WrongGenericParam` is deduced for the first argument, then
substituted into the second parameter, but the argument can not convert
to the parameter after substitution. In this case, deduction fails
instead of producig a call with an error in the second argument. The
resulting semir drops the call with an error argument:
```
-// CHECK:STDOUT:   %CallGenericMethod.specific_fn: <specific function> = specific_function %CallGenericMethod.ref, @CallGenericMethod(constants.%WrongGenericParam, <error>) [concrete = <error>]
-// CHECK:STDOUT:   %CallGenericMethod.call: init %empty_tuple.type = call %CallGenericMethod.specific_fn() [concrete = <error>]
```

2025-06-23 23:10:33 +00:00

base

Replacing lowering vectors with FixedSizeValueStore (#5636 )

2025-06-10 20:15:19 +00:00

check

Avoid deducing errors as argument instructions after subst (#5710 )

2025-06-23 23:10:33 +00:00

codegen

Shift from ARGS to EXTRA-ARGS where possible (#5602 )

2025-06-03 22:09:57 +00:00

diagnostics

Remove requirement that the pattern in a for starts with var. (#5685 )