Fix eq_op FP on literal of different form

[profetia]

Closes #15609

changelog: [eq_op] fix FP on literal of different form

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[profetia]

r? clippy

[samueltardieu]

Thanks for the PR.

I'd like to see a few more tests, for example ensuring that different style strings don't trigger the lint while identical ones will.

r? samueltardieu @rustbot author

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This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

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