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Rollup merge of #95131 - ehuss:fix-metadata-filename, r=bjorn3

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Fix docs for default rmeta filename.

The docs for the default filename for `--emit=metadata` was wrong, it was missing the `lib` prefix.  The current implementation for that default is [here](f2661cfe34/compiler/rustc_session/src/output.rs (L140)).  Perhaps somewhat confusing, but `lib` is used for all crate types.

cc https://github.com/rust-lang/rust/issues/68839#issuecomment-1073118716
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Matthias Krüger 2022-03-20 20:42:44 +01:00 • committed by GitHub
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src/doc/rustc/src/command-line-arguments.md
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@ -118,7 +118,7 @@ The valid emit kinds are:
- `llvm-ir` — Generates a file containing [LLVM IR]. The default output
filename is `CRATE_NAME.ll`.
- `metadata` — Generates a file containing metadata about the crate. The
default output filename is `CRATE_NAME.rmeta`.
default output filename is `libCRATE_NAME.rmeta`.
- `mir` — Generates a file containing rustc's mid-level intermediate
representation. The default output filename is `CRATE_NAME.mir`.
- `obj` — Generates a native object file. The default output filename is