Put all pointer tests into the same file (#139)

* Put all pointer tests into the same place

* windows workarounds

* Revert "windows workarounds"

This reverts commit 1463aa6.

* better? windows u happy now?..

* lol

tests/should_succeed/pointer.jou

@@ -1,4 +1,4 @@
-from "stdlib/io.jou" import putchar, puts
+from "stdlib/io.jou" import putchar, puts, printf
 from "stdlib/mem.jou" import malloc, free
 
 def putchar_pointer(ch: int*) -> void:
@@ -16,7 +16,22 @@ def myputs2(s: byte*) -> void:
     while *s != '\0':
         putchar(*s++)
 
+def foo(ptr: int*) -> void:
+    if ptr == NULL:
+        printf("Got NULL\n")
+    else:
+        printf("Got %d\n", *ptr)
+
 def main() -> int:
+    # Test assigning to pointer
+    foo: byte* = malloc(4)
+    *foo = 'a'
+    foo[1] = 'b'
+    foo[2] = 'c'
+    foo[3] = '\0'
+    puts(foo)  # Output: abc
+    free(foo)
+
     # Output: hhii
     putchar2('h')
     putchar2('i')
@@ -26,16 +41,17 @@ def main() -> int:
     putchar("hey"[1+1])  # Output: y
     putchar('\n')
 
+    # Make sure that unsigned indexes work. The compiler must
+    # convert them to signed for LLVM to be happy.
+    # Output: i
+    putchar("012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789abcdefghi"[128 as byte])
+    putchar('\n')
+
     myputs1("asd\n")  # Output: asd
     myputs2("foo\n")  # Output: foo
 
-    # Test assigning to pointer
-    foo: byte* = malloc(4)
-    foo[0] = 'a'
-    foo[1] = 'b'
-    foo[2] = 'c'
-    foo[3] = '\0'
-    puts(foo)  # Output: abc
-    free(foo)
+    x = 123
+    foo(&x)  # Output: Got 123
+    foo(NULL)  # Output: Got NULL
 
     return 0