patch 9.0.1452: code using EVAL_CONSTANT is dead, it is never set
Problem: Code using EVAL_CONSTANT is dead, it is never set.
Solution: Remove EVAL_CONSTANT. (closes #12252)
diff --git a/src/structs.h b/src/structs.h
index 9500139..3c52a63 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2102,9 +2102,8 @@
char_u *eval_tofree_lambda;
} evalarg_T;
-// Flags for expression evaluation.
+// Flag for expression evaluation.
#define EVAL_EVALUATE 1 // when missing don't actually evaluate
-#define EVAL_CONSTANT 2 // when not a constant return FAIL
# ifdef FEAT_PROFILE
/*