-fsanitize=address found a bug in my flat_map. *blush*

src/Makefile

@@ -1,6 +1,11 @@
 .PHONY: all clear 
 
-CXX=c++ -Wall -O0  -std=c++14 -g -glldb -fstack-protector-all
+#CXX=c++ -Wall -O0  -std=c++14 -g -glldb -fstack-protector-all
+
+# for AFL fuzzingtests:
+CXX=afl-clang++ -Wall -O0  -std=c++14 -g -glldb \
+ -fstack-protector-all -fsanitize=address \
+ -fno-omit-frame-pointer -fno-optimize-sibling-calls
 
 # !FIXME!
 GTEST_DIR=$(HOME)/code/googletest/

src/to_utf8.cc

@@ -30,8 +30,7 @@ namespace
                 return x;
             
             const Enc* f = std::lower_bound(b, e, x);
-            
-            return (f->from == x) ? f->to : x;
+            return (f == e || f->from != x) ? x : f->to;
         }
         
         const uint32_t min_element;