Fix `TODO()` macro to allow for printf-style args like the other `TRACEx()`-derrived macros.

Fortune for naka's current commit: Future curse − 末凶

include/macros.h

@@ -195,7 +195,7 @@ static_assert_eq(bswap(bswap(128lu)), 128, "bswap128 (lu) failed (3)");
 
 #define FATAL(msg, ...) (TRACEx(FATAL, "FATAL",   msg, ## __VA_ARGS__), abort())
 
-#define TODO(x) FATAL("function %s() is unimplemented: " x, __func__)
+#define TODO(x, ...) FATAL("function %s() is unimplemented: " x, __func__, ## __VA_ARGS__)
 
 //  Debug testing
 

src/display.c

@@ -45,6 +45,7 @@ void display_result(FILE* output, dispin_t input, dispkind_t how, dispflags_t fl
 		case DISPK_CSV:
 		case DISPK_BINARY:
 		case DISPK_INI:
-		default: COLD_EXPR(FATAL("unknown or unimplemented display kind: %d", (int)how));
+			TODO("display kind %d is unimplemented", (int)how);
+		default: COLD_EXPR(FATAL("unknown display kind: %d", (int)how));
 	}
 }