Fix macro expansion with common value

tests/include/tast2.h

@@ -24,14 +24,14 @@ extern "C" {
 #define MATHEXPR (1 + 2/3*20 - 100)
 #define ANDEXPR (100 & 11000)
 #define CASTEXPR (char) 34
-#define a 100
-#define b 200
-#define EQ1 a <= b
-#define EQ2 a >= b
-#define EQ3 a > b
-#define EQ4 a < b
-#define EQ5 a != b
-#define EQ6 a == b
+#define AVAL 100
+#define BVAL 200
+#define EQ1 AVAL <= BVAL
+#define EQ2 AVAL >= BVAL
+#define EQ3 AVAL > BVAL
+#define EQ4 AVAL < BVAL
+#define EQ5 AVAL != BVAL
+#define EQ6 AVAL == BVAL
 
 #define SIZEOF sizeof(char)
 

tests/tast2.nim

@@ -115,15 +115,15 @@ assert ULLEXPR == (1234.uint64 shl 3)
 assert LEXPR == (1234.int32 shl 4)
 assert LLEXPR == (1234.int64 shl 5)
 
-assert a == 100
-assert b == 200
+assert AVAL == 100
+assert BVAL == 200
 
-assert EQ1 == (a <= b)
-assert EQ2 == (a >= b)
-assert EQ3 == (a > b)
-assert EQ4 == (a < b)
-assert EQ5 == (a != b)
-assert EQ6 == (a == b)
+assert EQ1 == (AVAL <= BVAL)
+assert EQ2 == (AVAL >= BVAL)
+assert EQ3 == (AVAL > BVAL)
+assert EQ4 == (AVAL < BVAL)
+assert EQ5 == (AVAL != BVAL)
+assert EQ6 == (AVAL == BVAL)
 
 assert SIZEOF == 1