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Fix implicit overwrite for extensionless files #15243

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Fix implicit overwrite for extensionless files #15243

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5 changes: 5 additions & 0 deletions src/librustc/driver/driver.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -894,6 +894,11 @@ pub fn build_output_filenames(input: &Input,
};

let mut stem = input.filestem();

//Prevents damage to unstemmed source files
if stem == source_name(input){
sess.err(format!("File `{}` has a missing file extension", stem).as_slice());
}

// If a crateid is present, we use it as the link name
let crateid = attr::find_crateid(attrs);
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