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-rw-r--r--src/common.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/common.h b/src/common.h
index 43919b8..38ecc99 100644
--- a/src/common.h
+++ b/src/common.h
@@ -202,7 +202,7 @@ XTERN lin out_offset;
XTERN lin last_frozen_line;
bool copy_till (struct outstate *, lin);
-bool similar (char const *, size_t, char const *, size_t);
+bool similar (char const *, size_t, char const *, size_t) _GL_ATTRIBUTE_PURE;
#ifdef ENABLE_MERGE
enum conflict_style { MERGE_MERGE, MERGE_DIFF3 };