Rollup merge of #69656 - matthiaskrgr:iter_nth_zero, r=oli-obk

[rust.git] / src / librustc_mir / util / liveness.rs

diff --git a/src/librustc_mir/util/liveness.rs b/src/librustc_mir/util/liveness.rs
index 1488bfe4d627a62df142a99c82de259ce98a77cc..b12ad1e4c15cca55f8bee1d39e1690a8de49ebc9 100644 (file)
--- a/src/librustc_mir/util/liveness.rs
+++ b/src/librustc_mir/util/liveness.rs
@@ -36,7 +36,7 @@
 use rustc_index::bit_set::BitSet;
 use rustc_index::vec::{Idx, IndexVec};
 use std::fs;
-use std::io::{self, Write};
+use std::io::{self, BufWriter, Write};
 use std::path::{Path, PathBuf};
 
 pub type LiveVarSet = BitSet<Local>;
@@ -288,7 +288,8 @@ fn dump_matched_mir_node<'tcx>(
     let item_id = tcx.hir().as_local_hir_id(source.def_id()).unwrap();
     let file_name = format!("rustc.node{}{}-liveness.mir", item_id, pass_name);
     file_path.push(&file_name);
-    let _ = fs::File::create(&file_path).and_then(|mut file| {
+    let _ = fs::File::create(&file_path).and_then(|file| {
+        let mut file = BufWriter::new(file);
         writeln!(file, "// MIR local liveness analysis for `{}`", node_path)?;
         writeln!(file, "// source = {:?}", source)?;
         writeln!(file, "// pass_name = {}", pass_name)?;