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Preserve the type-as-written for bindings and use it in diagnostics. (#7804)

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In the `EntityName` for a binding, preserve the `TypeInstId` describing
how the type was written. When a diagnostic refers to that type via
`TypeOfInstId`, use the type-as-written in the diagnostic rather than
the canonical type.

Assisted-by: Claude Opus via Antigravity
This commit is contained in:
Richard Smith
2026-09-19 00:02:49 +00:00
committed by GitHub
parent d037848a96
commit 76e7fc5900
24 changed files with 223 additions and 167 deletions
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toolchain/check/testdata/interop/cpp/impls/implicit_as.carbon
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+5 -5
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@@ -92,7 +92,7 @@ import Cpp library "implicit_conversions.h";
fn NonConstConversionTest(s: Cpp.NonConstConversion) {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_expr_category.carbon:[[@LINE+7]]:21: error: cannot implicitly convert expression of type `Cpp.NonConstConversion` to `Cpp.Dest` [ConversionFailure]
// CHECK:STDERR: fail_expr_category.carbon:[[@LINE+7]]:21: error: cannot implicitly convert expression of type `NonConstConversion` to `Cpp.Dest` [ConversionFailure]
// CHECK:STDERR: let _: Cpp.Dest = s;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_expr_category.carbon:[[@LINE+4]]:21: note: type `Cpp.NonConstConversion` does not implement interface `Core.ImplicitAs(Cpp.Dest)` [MissingImplInMemberAccessInContext]
@@ -145,7 +145,7 @@ import Cpp library "implicit_conversions.h";
fn DeletedConstructorTest(s: Cpp.Source) {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_deleted.carbon:[[@LINE+7]]:35: error: cannot implicitly convert expression of type `Cpp.Source` to `Cpp.DeletedConstructor` [ConversionFailure]
// CHECK:STDERR: fail_deleted.carbon:[[@LINE+7]]:35: error: cannot implicitly convert expression of type `Source` to `Cpp.DeletedConstructor` [ConversionFailure]
// CHECK:STDERR: let _: Cpp.DeletedConstructor = s;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_deleted.carbon:[[@LINE+4]]:35: note: type `Cpp.Source` does not implement interface `Core.ImplicitAs(Cpp.DeletedConstructor)` [MissingImplInMemberAccessInContext]
@@ -158,7 +158,7 @@ fn DeletedConstructorTest(s: Cpp.Source) {
fn DeletedConversionTest(s: Cpp.DeletedConversion) {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_deleted.carbon:[[@LINE+7]]:21: error: cannot implicitly convert expression of type `Cpp.DeletedConversion` to `Cpp.Dest` [ConversionFailure]
// CHECK:STDERR: fail_deleted.carbon:[[@LINE+7]]:21: error: cannot implicitly convert expression of type `DeletedConversion` to `Cpp.Dest` [ConversionFailure]
// CHECK:STDERR: let _: Cpp.Dest = s;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_deleted.carbon:[[@LINE+4]]:21: note: type `Cpp.DeletedConversion` does not implement interface `Core.ImplicitAs(Cpp.Dest)` [MissingImplInMemberAccessInContext]
@@ -177,7 +177,7 @@ import Cpp library "implicit_conversions.h";
fn ExplicitConstructorTest(s: Cpp.Source) {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_explicit.carbon:[[@LINE+7]]:36: error: cannot implicitly convert expression of type `Cpp.Source` to `Cpp.ExplicitConstructor` [ConversionFailure]
// CHECK:STDERR: fail_explicit.carbon:[[@LINE+7]]:36: error: cannot implicitly convert expression of type `Source` to `Cpp.ExplicitConstructor` [ConversionFailure]
// CHECK:STDERR: let _: Cpp.ExplicitConstructor = s;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_explicit.carbon:[[@LINE+4]]:36: note: type `Cpp.Source` does not implement interface `Core.ImplicitAs(Cpp.ExplicitConstructor)` [MissingImplInMemberAccessInContext]
@@ -190,7 +190,7 @@ fn ExplicitConstructorTest(s: Cpp.Source) {
fn ExplicitConversionTest(s: Cpp.ExplicitConversion) {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_explicit.carbon:[[@LINE+7]]:21: error: cannot implicitly convert expression of type `Cpp.ExplicitConversion` to `Cpp.Dest` [ConversionFailure]
// CHECK:STDERR: fail_explicit.carbon:[[@LINE+7]]:21: error: cannot implicitly convert expression of type `ExplicitConversion` to `Cpp.Dest` [ConversionFailure]
// CHECK:STDERR: let _: Cpp.Dest = s;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_explicit.carbon:[[@LINE+4]]:21: note: type `Cpp.ExplicitConversion` does not implement interface `Core.ImplicitAs(Cpp.Dest)` [MissingImplInMemberAccessInContext]