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Relax alias restrictions. (#7190)

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Implement the alias rules from proposal #5389, wherein an alias is
permitted so long as the target has a constant value. While that
proposal is not yet accepted, this seems like a reasonable basis for
further iteration, and will be useful for the examples we're currently
pursuing.
This commit is contained in:
Richard Smith
2026-05-12 17:22:44 +00:00
committed by GitHub
parent d4063cad65
commit dd7cfdb149
35 changed files with 262 additions and 219 deletions
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toolchain/check/testdata/interop/cpp/class/export/class.carbon
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+4 -4
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@@ -84,13 +84,13 @@ class B(N:! i32) {
// TODO: Once we allow this, we should produce an "invalid array bound" error
// during monomorphization triggered by the C++ code.
// CHECK:STDERR: fail_todo_monomorphization_failure.carbon:[[@LINE+4]]:11: error: alias initializer must be a name reference [AliasRequiresNameRef]
// CHECK:STDERR: alias T = B(-1);
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
alias T = B(-1);
inline Cpp '''
// CHECK:STDERR: fail_todo_monomorphization_failure.carbon:[[@LINE+8]]:1: error: semantics TODO: `interop with unsupported type` [SemanticsTodo]
// CHECK:STDERR: Carbon::T t;
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_monomorphization_failure.carbon:[[@LINE+4]]:9: error: no type named 'T' in namespace 'Carbon' [CppInteropParseError]
// CHECK:STDERR: 22 | Carbon::T t;
// CHECK:STDERR: | ~~~~~~~~^