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-rw-r--r--src/libsyntax/ext/build.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 5d0853761ee..cde16d25412 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -767,7 +767,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         let loc = self.codemap().lookup_char_pos(span.lo);
         let expr_file = self.expr_str(span,
                                       token::intern_and_get_ident(&loc.file.name));
-        let expr_line = self.expr_usize(span, loc.line);
+        let expr_line = self.expr_u32(span, loc.line as u32);
         let expr_file_line_tuple = self.expr_tuple(span, vec!(expr_file, expr_line));
         let expr_file_line_ptr = self.expr_addr_of(span, expr_file_line_tuple);
         self.expr_call_global(