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-rw-r--r--lib/nimbase.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/nimbase.h b/lib/nimbase.h
index f73dca190..1100e084b 100644
--- a/lib/nimbase.h
+++ b/lib/nimbase.h
@@ -373,5 +373,8 @@ static inline void GCGuard (void *ptr) { asm volatile ("" :: "X" (ptr)); }
 #  define GC_GUARD
 #endif
 
+/* Test to see if nimrod and the C compiler agrees on the size of a pointer.
+   On disagreement, your C compiler will say something like: 
+   "error: 'assert_numbits' declared as an array with a negative size" */
 typedef int assert_numbits[sizeof(NI) == sizeof(void*) && NIM_INTBITS == sizeof(NI)*8 ? 1 : -1];
 #endif