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proc_macro_plugin: Wrap nonexistent filename in <>
I'm not sure how big of an issue this can become in practice, but `FileMap`s made from something that's not a file are supposed to wrap the file name in `<>`. For an example fix, see kevinmehall/rust-peg@332fd4d. There, it caused cargo to always recompile a crate using rust-peg, even when nothing was changed, because cargo sees that the dummy file doesn't exist.
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