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rustc: buffer the output writer for -Z ast-json[-noexpand]. #12999

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rustc: buffer the output writer for -Z ast-json[-noexpand]. #12999

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4 changes: 2 additions & 2 deletions src/librustc/driver/driver.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -186,7 +186,7 @@ pub fn phase_1_parse_input(sess: &Session, cfg: ast::CrateConfig, input: &Input)
});

if sess.opts.debugging_opts & session::AST_JSON_NOEXPAND != 0 {
let mut stdout = io::stdout();
let mut stdout = io::BufferedWriter::new(io::stdout());
let mut json = json::PrettyEncoder::new(&mut stdout);
krate.encode(&mut json);
}
Expand Down Expand Up @@ -261,7 +261,7 @@ pub fn phase_2_configure_and_expand(sess: &Session,
front::assign_node_ids_and_map::assign_node_ids_and_map(sess, krate));

if sess.opts.debugging_opts & session::AST_JSON != 0 {
let mut stdout = io::stdout();
let mut stdout = io::BufferedWriter::new(io::stdout());
let mut json = json::PrettyEncoder::new(&mut stdout);
krate.encode(&mut json);
}
Expand Down