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-rw-r--r--src/librustc_errors/emitter.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_errors/emitter.rs b/src/librustc_errors/emitter.rs
index aaae9965569..263ffb0d17c 100644
--- a/src/librustc_errors/emitter.rs
+++ b/src/librustc_errors/emitter.rs
@@ -1526,7 +1526,7 @@ impl EmitterWriter {
                     // length of the code after substitution
                     let full_sub_len = part.snippet.chars()
                         .map(|ch| unicode_width::UnicodeWidthChar::width(ch).unwrap_or(1))
-                        .sum() as isize;
+                        .sum::<usize>() as isize;
 
                     // length of the code to be substituted
                     let snippet_len = span_end_pos as isize - span_start_pos as isize;