Crafter.Build/tests/DuplicateModule/fixture/a/interfaces/A.cppm

export module A;
import std;
import M;
export std::int32_t ASize() {
    return Size();
}
test: two builds of one module are refused before anything compiles The fixture is P -> M and P -> A -> M, where M's own flag --wide changes a struct it exports. Loaded with --wide --split, P gives M its args without --wide while A passes them on whole: Build(P) has to fail, name the module and both paths, and leave no bin/ anywhere. Loaded with --wide alone, both paths give M the same list, there is one M, and the build has to go through. Before the fix the first case built cleanly. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> 2026-10-31 05:19:30 +01:00			`export module A;`
			`import std;`
			`import M;`
			`export std::int32_t ASize() {`
			`return Size();`
			`}`