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Support accessing associated functions by member access into facets (#4872)

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For an expression such as `(Type as Interface).AssocFn()`, track the
`Self` type `Type` in the result of the member access so that it's
available when checking the function call.

This introduces a new kind of type, `ImplFunctionType`, that represents
the type of a function that is expected within an impl, modeled as the
type of the function within the interface plus a value to use as `Self`.
Calls to values of this type behave like calls to the underlying
function except that the `Self` parameter is pre-bound to the self type
from the facet.

In order to support this, fix an issue where the imported list of
generic bindings lost their association with their enclosing generic.
This adds a little complexity to `import_ref`, including a new recursive
cycle that I intend to address in a follow-up PR.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
This commit is contained in:
Richard Smith
2025-02-04 22:38:38 +00:00
committed by GitHub
co-authored by Jon Ross-Perkins
parent dcfccd3187
commit fcfb1345d5
234 changed files with 4213 additions and 2531 deletions
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toolchain/check/interface.h
+2 -2
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@@ -18,9 +18,9 @@ auto BuildAssociatedEntity(Context& context, SemIR::InterfaceId interface_id,
SemIR::InstId decl_id) -> SemIR::InstId;
// Gets the self specific of a generic declaration that is an interface member,
// given a specific for an enclosing generic, plus a type to use as `Self`.
// given a specific for the interface plus a type to use as `Self`.
auto GetSelfSpecificForInterfaceMemberWithSelfType(
Context& context, SemIRLoc loc, SemIR::SpecificId enclosing_specific_id,
Context& context, SemIRLoc loc, SemIR::SpecificId interface_specific_id,
SemIR::GenericId generic_id, SemIR::TypeId self_type_id,
SemIR::InstId witness_inst_id) -> SemIR::SpecificId;