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Strip a single leading tab when rendering dataflow diffs #76775

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Sep 16, 2020
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Strip a single leading tab when rendering dataflow diffs #76775

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2 changes: 1 addition & 1 deletion compiler/rustc_mir/src/dataflow/framework/graphviz.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -578,7 +578,7 @@ where
return String::new();
}

let re = Regex::new("\u{001f}([+-])").unwrap();
let re = Regex::new("\t?\u{001f}([+-])").unwrap();
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Why not using OnceCell here for the Regex to avoid repeatedly compiling ?

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This is debug-only code so it doesn't matter too much in practice, and I'd guess this regex is so small it compiles nearly instantaneously. I wouldn't object to a PR adding a OnceCell if it didn't add too much noise to this code.


let raw_diff = format!("{:#?}", DebugDiffWithAdapter { new, old, ctxt });

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