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Use serde_json::to_writer for JsonEmitter::emit

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Avoids an unnecessary intermediate string.
This commit is contained in:
Jeremy Fitzhardinge 2023-09-09 11:30:23 -07:00 committed by Jeremy Fitzhardinge
parent 54267ddc0c
commit 00adbb2d5a
1 changed files with 5 additions and 4 deletions
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9
compiler/rustc_errors/src/json.rs
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@ -148,11 +148,12 @@ impl JsonEmitter {
fn emit(&mut self, val: EmitTyped<'_>) -> io::Result<()> { fn emit(&mut self, val: EmitTyped<'_>) -> io::Result<()> {
if self.pretty { if self.pretty {
writeln!(self.dst, "{}", serde_json::to_string_pretty(&val).unwrap()) serde_json::to_writer_pretty(&mut *self.dst, &val)?
} else { } else {
writeln!(self.dst, "{}", serde_json::to_string(&val).unwrap()) serde_json::to_writer(&mut *self.dst, &val)?
} };
.and_then(|_| self.dst.flush()) self.dst.write_all(b"\n")?;
self.dst.flush()
} }
} }