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Rollup merge of #67432 - Mark-Simulacrum:fix-toolstate, r=Centril

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Fix toolstate history format

We were inserting *before* the existing newline, so we should prepend it
not append it to our inserted string.
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Mark Rousskov 2019-12-19 17:53:57 -05:00 • committed by GitHub
commit 8f20e67501
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src/bootstrap/toolstate.rs
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@ -413,7 +413,7 @@ fn change_toolstate(
let history_path = format!("rust-toolstate/history/{}.tsv", OS.expect("linux/windows only"));
let mut file = t!(fs::read_to_string(&history_path));
let end_of_first_line = file.find('\n').unwrap();
file.insert_str(end_of_first_line, &format!("{}\t{}\n", commit, toolstate_serialized));
file.insert_str(end_of_first_line, &format!("\n{}\t{}", commit, toolstate_serialized));
t!(fs::write(&history_path, file));
}