test_edge_closures: LLVM IR `@perry_global_*` name collision (duplicate global at numeric suffix __22)

[proggeramlug]

Summary

test_edge_closures.ts fails to compile with:

error: redefinition of global '@perry_global_test_edge_closures_ts__22'
✗ ENTRY MODULE FAILED TO COMPILE — REFUSING TO LINK

Pre-existing — reproduces on v0.5.502 / v0.5.503 / v0.5.510 unchanged. Surfaced during v0.5.510 release-CI gate audit; was previously not in test-parity/known_failures.json and started failing the parity gate when the empty {} known_failures + this test's drift collided on a recent commit.

Repro

./target/release/perry test-files/test_edge_closures.ts -o /tmp/test_edge_closures

Fails with the redefinition error.

Suspected root cause

The numeric suffix on @perry_global_<module>__<id> globals is allocated per-module. A closure-related lowering path in test_edge_closures.ts is emitting the same id twice — likely a next_global_id counter not being incremented on one of two emission sites. Worth grepping crates/perry-codegen/src/codegen.rs and crates/perry-codegen/src/expr.rs for perry_global_ emissions where the same id can be produced twice (e.g. one branch increments before emit, another increments after).

Workaround

Test is currently entered into test-parity/known_failures.json so CI passes. Underlying bug should be fixed in a follow-up.