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Document behaviour of --remap-path-prefix with several matches #105532

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Document behaviour of --remap-path-prefix with several matches #105532

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3 changes: 3 additions & 0 deletions src/doc/rustc/src/command-line-arguments.md
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Expand Up @@ -434,6 +434,9 @@ replacement is purely textual, with no consideration of the current system's
pathname syntax. For example `--remap-path-prefix foo=bar` will match
`foo/lib.rs` but not `./foo/lib.rs`.

When multiple remappings are given and several of them match, the **last**
matching one is applied.

<a id="option-json"></a>
## `--json`: configure json messages printed by the compiler

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