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C++ interop: Don't crash when looking up names inside an incomplete C++ class/struct/union (#6096)

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Only do the lookup when the class is complete.

Before this change we crash in `Sema::LookupQualifiedName()` on
`Declaration context must already be complete!`.
This commit is contained in:
Boaz Brickner
2025-09-18 22:03:42 +00:00
committed by GitHub
parent d137cbe1f1
commit 868c4b768c
5 changed files with 113 additions and 0 deletions
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toolchain/check/testdata/interop/cpp/function/struct.carbon
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+26
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@@ -339,6 +339,32 @@ fn F() {
//@dump-sem-ir-end
}
// ============================================================================
// Incomplete struct
// ============================================================================
// --- incomplete.h
struct Incomplete;
// --- fail_import_incomplete.carbon
library "[[@TEST_NAME]]";
import Cpp library "incomplete.h";
fn F() {
// CHECK:STDERR: fail_import_incomplete.carbon:[[@LINE+8]]:3: error: member access into incomplete class `Cpp.Incomplete` [QualifiedExprInIncompleteClassScope]
// CHECK:STDERR: Cpp.Incomplete.foo();
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_import_incomplete.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./incomplete.h:2:8: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR: struct Incomplete;
// CHECK:STDERR: ^
// CHECK:STDERR:
Cpp.Incomplete.foo();
}
// ============================================================================
// Pointer to forward-declared struct as parameter type
// ============================================================================