Use a different lint for the fix_only_once_for_duplicates
test
#15713
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What does this PR try to resolve?
This PR changes the triggering
rustc
lint in thefix_only_once_for_duplicates
test fromunused_must_use
toforgetting_references
, because we are changing in rust-lang/rust#143030 the interaction between that lint and macros.This is required as it blocking the rust PR, rust-lang/rust#143030 (comment).
How to test and review this PR?
Look at the test changes.