gh-144: Fix passing/join-pointer-writeback.pre

Author: python-processing-unit

tests/cases/passing/join-pointer-writeback.pre

@@ -2,19 +2,35 @@ STR: s1 = "foo"
 STR: s2 = "bar"
 JOIN(@s1, s2)
 ASSERT(EQ(s1, "foobar"))
+ASSERT(EQ(s2, "bar"))
+
+STR: s1 = "foo"
+STR: s2 = "bar"
+JOIN(s1, @s2)
+ASSERT(EQ(s1, "foo"))
 ASSERT(EQ(s2, "foobar"))
 
-// separator-mode: first arg is single-char separator, writeback for args 1..n-1 only
-STR: sep = ","
-STR: a1 = "one"
-STR: b1 = "two"
-JOIN(sep, @a1, b1)
-ASSERT(EQ(a1, "one,two"))
-ASSERT(EQ(b1, "one,two"))
+STR: s1 = "foo"
+STR: s2 = "bar"
+JOIN(@s1, @s2)
+ASSERT(EQ(s1, "foobar"))
+ASSERT(EQ(s2, "foobar"))
 
-// integer join mode (joins integer string representations)
-INT: i1 = 0d10
-INT: i2 = 0d5
+! integer join mode (joins integer binary spellings)
+INT: i1 = 0b1010
+INT: i2 = 0b101
 JOIN(@i1, i2)
-ASSERT(EQ(i1, 0d105))
-ASSERT(EQ(i2, 0d105))
+ASSERT(EQ(i1, 0b1010101))
+ASSERT(EQ(i2, 0b101))
+
+INT: i1 = 0b1010
+INT: i2 = 0b101
+JOIN(i1, @i2)
+ASSERT(EQ(i1, 0b1010))
+ASSERT(EQ(i2, 0b1010101))
+
+INT: i1 = 0b1010
+INT: i2 = 0b101
+JOIN(@i1, @i2)
+ASSERT(EQ(i1, 0b1010101))
+ASSERT(EQ(i2, 0b1010101))