rust/coverage at da969d41a31b6838500b626d9699f65459198387 - rust

History

bors 7a58674259 Auto merge of #124255 - RenjiSann:renji/mcdc-nested-expressions, r=Zalathar MCDC coverage: support nested decision coverage #123409 provided the initial MCDC coverage implementation. As referenced in #124144, it does not currently support "nested" decisions, like the following example : ```rust fn nested_if_in_condition(a: bool, b: bool, c: bool) { if a && if b \|\| c { true } else { false } { say("yes"); } else { say("no"); } } ``` Note that there is an if-expression (`if b \|\| c ...`) embedded inside a boolean expression in the decision of an outer if-expression. This PR proposes a workaround for this cases, by introducing a Decision context stack, and by handing several `temporary condition bitmaps` instead of just one. When instrumenting boolean expressions, if the current node is a leaf condition (i.e. not a `\|\|`/`&&` logical operator nor a `!` not operator), we insert a new decision context, such that if there are more boolean expressions inside the condition, they are handled as separate expressions. On the codegen LLVM side, we allocate as many `temp_cond_bitmap`s as necessary to handle the maximum encountered decision depth.		2024-04-29 11:54:49 +00:00
..
auxiliary	coverage: Remove all unstable values of `-Cinstrument-coverage`	2024-03-13 11:14:09 +11:00
branch	coverage: Branch coverage tests for match arms	2024-04-22 21:55:33 +10:00
abort.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
abort.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
abort.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
assert_not.cov-map
assert_not.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
assert_not.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
assert.cov-map
assert.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
assert.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
async2.cov-map
async2.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
async2.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
async_block.cov-map
async_block.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
async_block.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
async.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
async.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
async.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
bad_counter_ids.cov-map	coverage: Use normal `edition:` headers in coverage tests	2024-02-02 11:17:05 +11:00
bad_counter_ids.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
bad_counter_ids.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
bench.cov-map	Add `#[coverage(off)]` to closures introduced by `#[test]`/`#[bench]`	2024-01-21 23:17:00 +11:00
bench.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
bench.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure_bug.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
closure_bug.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
closure_bug.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
closure_macro_async.cov-map	coverage: Eagerly deduplicate covspans with the same span	2024-02-21 21:25:35 +11:00
closure_macro_async.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure_macro_async.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure_macro.cov-map	coverage: Eagerly deduplicate covspans with the same span	2024-02-21 21:25:35 +11:00
closure_macro.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure_macro.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure_unit_return.cov-map	coverage: Discard spans that fill the entire function body	2024-02-16 10:57:03 +11:00
closure_unit_return.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure_unit_return.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure.cov-map	Enable by default.	2024-02-09 21:13:51 +00:00
closure.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
closure.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
color.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
color.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
conditions.cov-map	coverage: Tweak individual tests to be unaffected by `rustfmt`	2024-01-16 16:14:27 +11:00
conditions.coverage	coverage: Tweak individual tests to be unaffected by `rustfmt`	2024-01-16 16:14:27 +11:00
conditions.rs	coverage: Tweak individual tests to be unaffected by `rustfmt`	2024-01-16 16:14:27 +11:00
continue.cov-map
continue.coverage
continue.rs
coroutine.cov-map	Error on using `yield` without also using `#[coroutine]` on the closure	2024-04-24 08:05:29 +00:00
coroutine.coverage	Error on using `yield` without also using `#[coroutine]` on the closure	2024-04-24 08:05:29 +00:00
coroutine.rs	Error on using `yield` without also using `#[coroutine]` on the closure	2024-04-24 08:05:29 +00:00
coverage_attr_closure.cov-map	coverage: Discard spans that fill the entire function body	2024-02-16 10:57:03 +11:00
coverage_attr_closure.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
coverage_attr_closure.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
dead_code.cov-map
dead_code.coverage
dead_code.rs
drop_trait.cov-map
drop_trait.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
drop_trait.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
fn_sig_into_try.cov-map	coverage: Tweak individual tests to be unaffected by `rustfmt`	2024-01-16 16:14:27 +11:00
fn_sig_into_try.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
fn_sig_into_try.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
generics.cov-map
generics.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
generics.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
if_else.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
if_else.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
if_else.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
if_not.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
if_not.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
if_not.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
if.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
if.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
if.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
ignore_map.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
ignore_map.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
ignore_run.cov-map
ignore_run.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
inline-dead.cov-map	coverage: Discard spans that fill the entire function body	2024-02-16 10:57:03 +11:00
inline-dead.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
inline-dead.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
inline.cov-map
inline.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
inline.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
inner_items.cov-map
inner_items.coverage
inner_items.rs
issue-83601.cov-map	coverage: Don't instrument `#[automatically_derived]` functions	2024-01-22 12:18:57 +11:00
issue-83601.coverage	coverage: Don't instrument `#[automatically_derived]` functions	2024-01-22 12:18:57 +11:00
issue-83601.rs
issue-84561.cov-map	Enable by default.	2024-02-09 21:13:51 +00:00
issue-84561.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
issue-84561.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
issue-85461.cov-map
issue-85461.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
issue-85461.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
issue-93054.cov-map	coverage: Use normal `edition:` headers in coverage tests	2024-02-02 11:17:05 +11:00
issue-93054.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
issue-93054.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
lazy_boolean.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
lazy_boolean.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
lazy_boolean.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
let_else_loop.cov-map	coverage: Regression test for ICE triggered by self-loops	2024-03-20 18:14:35 +11:00
let_else_loop.coverage	coverage: Remove incorrect assertions from counter allocation	2024-03-20 18:22:15 +11:00
let_else_loop.rs	coverage: Remove incorrect assertions from counter allocation	2024-03-20 18:22:15 +11:00
long_and_wide.cov-map
long_and_wide.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
long_and_wide.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
loop_break_value.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
loop_break_value.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
loop_break_value.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
loops_branches.cov-map
loops_branches.coverage
loops_branches.rs
macro_in_closure.cov-map	coverage: Test for closure body that is a single bang-macro	2024-02-05 10:07:18 +11:00
macro_in_closure.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
macro_in_closure.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
macro_name_span.cov-map	coverage: Discard spans that fill the entire function body	2024-02-16 10:57:03 +11:00
macro_name_span.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
macro_name_span.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
match_or_pattern.cov-map
match_or_pattern.coverage
match_or_pattern.rs
mcdc_if.cov-map	coverage. Add basic tests for MC/DC	2024-04-20 00:34:40 +08:00
mcdc_if.coverage	coverage. Add basic tests for MC/DC	2024-04-20 00:34:40 +08:00
mcdc_if.rs	coverage. Add basic tests for MC/DC	2024-04-20 00:34:40 +08:00
mcdc_nested_if.cov-map	tests(mcdc-coverage): Add tests for nested decision structures in mcdc_nested_if.rs	2024-04-29 09:13:41 +00:00
mcdc_nested_if.coverage	tests(mcdc-coverage): Add tests for nested decision structures in mcdc_nested_if.rs	2024-04-29 09:13:41 +00:00
mcdc_nested_if.rs	tests(mcdc-coverage): Add tests for nested decision structures in mcdc_nested_if.rs	2024-04-29 09:13:41 +00:00
nested_loops.cov-map
nested_loops.coverage
nested_loops.rs
no_cov_crate.cov-map
no_cov_crate.coverage
no_cov_crate.rs
no_spans_if_not.cov-map	macro_rules: Preserve all metavariable spans in a global side table	2024-02-18 11:19:24 +03:00
no_spans_if_not.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
no_spans_if_not.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
no_spans.cov-map	macro_rules: Preserve all metavariable spans in a global side table	2024-02-18 11:19:24 +03:00
no_spans.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
no_spans.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
overflow.cov-map
overflow.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
overflow.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
panic_unwind.cov-map
panic_unwind.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
panic_unwind.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
partial_eq.cov-map	coverage: Don't instrument `#[automatically_derived]` functions	2024-01-22 12:18:57 +11:00
partial_eq.coverage	coverage: Don't instrument `#[automatically_derived]` functions	2024-01-22 12:18:57 +11:00
partial_eq.rs	coverage: Format all remaining tests	2024-01-18 10:42:37 +11:00
README.md
simple_loop.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
simple_loop.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
simple_loop.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
simple_match.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
simple_match.coverage	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
simple_match.rs	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
sort_groups.cov-map
sort_groups.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
sort_groups.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
test_harness.cov-map	Add `#[coverage(off)]` to closures introduced by `#[test]`/`#[bench]`	2024-01-21 23:17:00 +11:00
test_harness.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
test_harness.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
thin-lto.cov-map	coverage: Format all remaining tests	2024-01-18 10:42:37 +11:00
thin-lto.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
thin-lto.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
tight_inf_loop.cov-map
tight_inf_loop.coverage
tight_inf_loop.rs
trivial.cov-map
trivial.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
trivial.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
try_error_result.cov-map	Enable by default.	2024-02-09 21:13:51 +00:00
try_error_result.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
try_error_result.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
unicode.cov-map	coverage: Discard spans that fill the entire function body	2024-02-16 10:57:03 +11:00
unicode.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
unicode.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
unreachable.cov-map	Eliminate `UbCheck` for non-standard libraries	2024-03-27 21:02:40 +08:00
unreachable.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
unreachable.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
unused_mod.cov-map
unused_mod.coverage
unused_mod.rs
unused.cov-map
unused.coverage
unused.rs
uses_crate.cov-map
uses_crate.coverage	coverage: Remove all unstable values of `-Cinstrument-coverage`	2024-03-13 11:14:09 +11:00
uses_crate.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
uses_inline_crate.cov-map
uses_inline_crate.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
uses_inline_crate.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
while_early_ret.cov-map	coverage: Add `#[rustfmt::skip]` to tests with non-standard formatting	2024-01-16 15:56:37 +11:00
while_early_ret.coverage	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
while_early_ret.rs	[AUTO_GENERATED] Migrate compiletest to use `ui_test`-style `//@` directives	2024-02-22 16:04:04 +00:00
while.cov-map	coverage: Tweak individual tests to be unaffected by `rustfmt`	2024-01-16 16:14:27 +11:00
while.coverage	coverage: Tweak individual tests to be unaffected by `rustfmt`	2024-01-16 16:14:27 +11:00
while.rs	coverage: Tweak individual tests to be unaffected by `rustfmt`	2024-01-16 16:14:27 +11:00
yield.cov-map	Error on using `yield` without also using `#[coroutine]` on the closure	2024-04-24 08:05:29 +00:00
yield.coverage	Error on using `yield` without also using `#[coroutine]` on the closure	2024-04-24 08:05:29 +00:00
yield.rs	Error on using `yield` without also using `#[coroutine]` on the closure	2024-04-24 08:05:29 +00:00

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.