Fix find_format_arg_expr
when incremental compilation is enabled
#10980
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Fixes #10969
lower_span
gives AST spans a parent when lowering to the HIR. That meant the==
span comparison would return false even though the spans are pointing to the same thing. We now ignore the parent when comparing the spansDebugging this was quite the puzzle, because the parent is not included in the debug output of
Span
s orSpanData
😬changelog: none