debug/assert: give WARN_RETURN a sane name

debug/assert.hpp

@@ -75,6 +75,21 @@ constexpr bool debug_enabled = false;
 } while (0)
 
 
+#define RETURN_FALSE_UNLESS(CONDITION) {                                           \
+    if (const auto &__return_false_unless = (CONDITION); !__return_false_unless) { \
+        if constexpr (debug_enabled) {                                             \
+            std::cerr << __FILE__ << ':'                                           \
+                      << __LINE__ << ':'                                           \
+                      << __PRETTY_FUNCTION__ << "; "                               \
+                      << #CONDITION << '\n';                                       \
+            breakpoint ();                                                         \
+        }                                                                          \
+                                                                                   \
+        return false;                                                              \
+    }                                                                              \
+} while (0)
+
+
 #define WARN_RETURN(CONDITION,VALUE) do {                           \
     if (const auto& __warn_return = (CONDITION); !!__warn_return) { \
         if constexpr (debug_enabled) {                              \