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use RUSTC environment var in parse_and_replace::compile if present
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Cargo respects this environment variable (to specify the path to what rustc binary to use), but the Rustfix test suite did not. However, this capability is useful when developing new compiler diagnostics that one wants Rustfix to be able to handle (this being inspired by work on the endeavor that is rust-lang/rust#53013).
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Cargo respects this environment variable (to specify the path to what
rustc binary to use), but the Rustfix test suite did not. However, this
capability is useful when developing new compiler diagnostics that one
wants Rustfix to be able to handle (this being inspired by the endeavor
that is rust-lang/rust#53013).