// E6b — ambiguity guard for an ERROR-SET name in a CLOSURE-LITERAL return
// annotation (`closure(() -> !IoErr { … })`). `main` flat-imports two modules
// that each author a same-name `IoErr` and authors none itself, so the closure
// literal's `-> !IoErr` channel is a genuine collision the source cannot
// disambiguate. It must emit the LOUD "type 'IoErr' is ambiguous" diagnostic and
// poison the channel — NEVER silently pick a global `findByName` last-wins author.
//
// NOTE on fail-before/pass-after: unlike the OWN-WINS sibling (0813), this
// AMBIGUITY case does NOT fail-before on attempt-1's binary. The pre-lowering
// closure-shape pass (`convergeClosureShapeSets` → `recordClosureShape`) resolves
// every closure literal's return annotation through the source-aware
// `resolveType` (`resolveTypeWithBindings`), which attempt-1 already routed
// error-set authors through — so the ambiguity is detected there and reported
// regardless of `lowerLambda`. (For a `-> !Named` set that pass bails early after
// resolving, so the OWN-WINS membership in 0813 still flowed through the stateless
// `lowerLambda` path that attempt-2 fixes.) This example is the standing GUARD
// that the lambda `-> !Named` ambiguity stays reported across both source-aware
// sites; 0813 is the one that exercises attempt-2's `lowerLambda` channel fix.

#import "modules/std.sx";
#import "0814-modules-same-name-error-set-lambda-ambiguous/a.sx";
#import "0814-modules-same-name-error-set-lambda-ambiguous/b.sx";

main :: () -> s32 {
    fail_io := closure(() -> !IoErr { return; });
    return 0;
}