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Zalathar 7ca4d1f6a1 coverage: Regression test for "function name is empty" bug 
The bug was triggered by a particular usage of the `?` try operator in a
proc-macro expansion.

Thanks to lqd for the minimization.

Co-authored-by: Rémy Rakic <remy.rakic+github@gmail.com>
2025-07-29 11:36:43 +10:00
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auxiliary
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
branch
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condition
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mcdc
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abort.cov-map
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abort.coverage
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abort.rs
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assert_not.cov-map
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assert_not.coverage
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assert_not.rs
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assert-ne.cov-map
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assert-ne.coverage
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assert-ne.rs
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assert.cov-map
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assert.coverage
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assert.rs
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async2.cov-map
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async2.coverage
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async2.rs
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async_block.cov-map
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async_block.coverage
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async_block.rs
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async_closure.cov-map
Revert "coverage: Enlarge empty spans during MIR instrumentation, not codegen"
2025-07-26 11:14:40 +10:00
async_closure.coverage
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async_closure.rs
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async.cov-map
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async.coverage
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async.rs
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await_ready.cov-map
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await_ready.coverage
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await_ready.rs
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bad_counter_ids.cov-map
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bad_counter_ids.coverage
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bad_counter_ids.rs
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bench.cov-map
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bench.coverage
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bench.rs
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closure_bug.cov-map
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closure_bug.coverage
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closure_bug.rs
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closure_macro_async.cov-map
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closure_macro_async.coverage
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closure_macro_async.rs
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closure_macro.cov-map
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closure_macro.coverage
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closure_macro.rs
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closure_unit_return.cov-map
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closure_unit_return.coverage
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closure_unit_return.rs
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closure.cov-map
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closure.coverage
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closure.rs
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color.coverage
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color.rs
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conditions.cov-map
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conditions.coverage
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conditions.rs
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continue.cov-map
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continue.coverage
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continue.rs
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coroutine.cov-map
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coroutine.coverage
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coroutine.rs
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coverage_attr_closure.cov-map
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coverage_attr_closure.coverage
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coverage_attr_closure.rs
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dead_code.cov-map
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dead_code.coverage
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dead_code.rs
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discard-all-issue-133606.coverage
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discard-all-issue-133606.rs
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drop_trait.cov-map
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drop_trait.coverage
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drop_trait.rs
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fn_sig_into_try.cov-map
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fn_sig_into_try.coverage
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fn_sig_into_try.rs
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generic-unused-impl.cov-map
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generic-unused-impl.coverage
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generic-unused-impl.rs
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generics.cov-map
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generics.coverage
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generics.rs
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holes.cov-map
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holes.coverage
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holes.rs
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if_else.cov-map
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if_else.coverage
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if_else.rs
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if_not.cov-map
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if_not.coverage
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if_not.rs
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if.cov-map
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if.coverage
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if.rs
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ignore_map.coverage
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ignore_map.rs
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ignore_run.cov-map
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ignore_run.rs
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inline_mixed.rs
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inline-dead.cov-map
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inline-dead.coverage
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inline-dead.rs
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inline.cov-map
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inline.coverage
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inline.rs
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inner_items.cov-map
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inner_items.coverage
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inner_items.rs
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lazy_boolean.cov-map
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lazy_boolean.rs
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let_else_loop.cov-map
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let_else_loop.coverage
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let_else_loop.rs
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long_and_wide.cov-map
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long_and_wide.coverage
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long_and_wide.rs
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loop_break_value.cov-map
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loop_break_value.coverage
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loop_break_value.rs
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loop-break.cov-map
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loop-break.coverage
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loop-break.rs
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loops_branches.cov-map
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loops_branches.coverage
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loops_branches.rs
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macro_in_closure.cov-map
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macro_in_closure.coverage
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macro_in_closure.rs
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macro_name_span.cov-map
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macro_name_span.coverage
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macro_name_span.rs
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match_or_pattern.cov-map
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match_or_pattern.coverage
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match_or_pattern.rs
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nested_loops.cov-map
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nested_loops.coverage
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nested_loops.rs
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no_cov_crate.cov-map
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no_cov_crate.coverage
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no_cov_crate.rs
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no_spans_if_not.cov-map
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no_spans_if_not.coverage
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no_spans_if_not.rs
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no_spans.rs
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no-core.cov-map
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no-core.rs
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overflow.cov-map
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overflow.coverage
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overflow.rs
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panic_unwind.cov-map
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panic_unwind.coverage
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panic_unwind.rs
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partial_eq.cov-map
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partial_eq.coverage
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partial_eq.rs
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README.md
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simple_loop.cov-map
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simple_loop.coverage
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simple_loop.rs
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simple_match.cov-map
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simple_match.coverage
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simple_match.rs
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sort_groups.cov-map
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sort_groups.rs
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test_harness.cov-map
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test_harness.rs
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tight_inf_loop.cov-map
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tight_inf_loop.coverage
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tight_inf_loop.rs
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trivial.cov-map
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trivial.coverage
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trivial.rs
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try_error_result.cov-map
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try_error_result.coverage
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try_error_result.rs
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try-in-macro.attr.cov-map
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
try-in-macro.attr.coverage
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
try-in-macro.bang.cov-map
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
try-in-macro.bang.coverage
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
try-in-macro.derive.cov-map
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
try-in-macro.derive.coverage
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
try-in-macro.rs
coverage: Regression test for "function name is empty" bug
2025-07-29 11:36:43 +10:00
unicode.cov-map
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unicode.coverage
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unicode.rs
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unreachable.cov-map
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unreachable.rs
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unused_mod.cov-map
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unused_mod.coverage
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unused_mod.rs
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unused.cov-map
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unused.coverage
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unused.rs
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uses_crate.cov-map
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uses_crate.coverage
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uses_crate.rs
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uses_inline_crate.cov-map
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uses_inline_crate.coverage
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uses_inline_crate.rs
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while_early_ret.cov-map
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while_early_ret.coverage
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while_early_ret.rs
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while.cov-map
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while.coverage
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while.rs
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yield.cov-map
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yield.coverage
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yield.rs
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README.md

The tests in this directory are shared by two different test modes, and can be run in multiple different ways:

  • ./x.py test coverage-map (compiles to LLVM IR and checks coverage mappings)
  • ./x.py test coverage-run (runs a test binary and checks its coverage report)
  • ./x.py test coverage (runs both coverage-map and coverage-run)

Maintenance note

These tests can be sensitive to small changes in MIR spans or MIR control flow, especially in HIR-to-MIR lowering or MIR optimizations.

If you haven't touched the coverage code directly, and the tests still pass in coverage-run mode, then it should usually be OK to just re-bless the mappings as necessary with ./x.py test coverage-map --bless, without worrying too much about the exact changes.

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