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-rw-r--r--src/librustc_parse/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustc_parse/lib.rs b/src/librustc_parse/lib.rs
index 4aad2c0f68a..40d7a34a8b0 100644
--- a/src/librustc_parse/lib.rs
+++ b/src/librustc_parse/lib.rs
@@ -172,6 +172,7 @@ fn maybe_source_file_to_parser(
     parser.unclosed_delims = unclosed_delims;
     if parser.token == token::Eof && parser.token.span.is_dummy() {
         parser.token.span = Span::new(end_pos, end_pos, parser.token.span.ctxt());
+        assert!(parser.unnormalized_token.is_none());
     }
 
     Ok(parser)