rust/compiler/rustc_mir
bors e5f83d24ae Auto merge of #84797 - richkadel:cover-unreachable-statements, r=tmandry
Report coverage `0` of dead blocks

Fixes: #84018

With `-Z instrument-coverage`, coverage reporting of dead blocks
(for example, blocks dropped because a conditional branch is dropped,
based on const evaluation) is now supported.

If `instrument-coverage` is enabled, `simplify::remove_dead_blocks()`
finds all dropped coverage `Statement`s and adds their `code_region`s as
`Unreachable` coverage `Statement`s to the `START_BLOCK`, so they are
still included in the coverage map.

Check out the resulting changes in the test coverage reports in this PR (in [commit 1](0b0d293c7c)).

r? `@tmandry`
cc: `@wesleywiser`
2021-05-07 10:06:40 +00:00
..
src Auto merge of #84797 - richkadel:cover-unreachable-statements, r=tmandry 2021-05-07 10:06:40 +00:00
Cargo.toml