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Fix verbose messages claiming non-existent errors

They were confusing when trying to debug other things

--- a/src/asm/lexer.c

+++ b/src/asm/lexer.c

@@ -504,9 +504,15 @@

 	}

 	if (!state->isMmapped) {

 		/* Sometimes mmap() fails or isn't available, so have a fallback */

-		if (verbose)

-			printf("File %s opened as regular, errno reports \"%s\"\n",

-			       path, strerror(errno));

+		if (verbose) {

+			if (isStdin)

+				printf("Opening stdin\n");

+			else if (fileInfo.st_size == 0)

+				printf("File %s is empty\n", path);

+			else

+				printf("File %s opened as regular, errno reports \"%s\"\n",

+				       path, strerror(errno));

+		}

 		state->index = 0;

 		state->nbChars = 0;

 	}