Fix operator parsing

regression/cpp/Function_Overloading3/main.cpp

@@ -0,0 +1,28 @@
+class t1
+{
+public:
+  t1(int n) : value(n)
+  {
+  }
+
+  int value;
+  int operator[](int n)
+  {
+    return n * value;
+  }
+};
+
+int operator+(t1 left, int right)
+{
+  return left.value + right;
+}
+
+int main()
+{
+  t1 t(10);
+  int t_1 = t + 5;
+  int t_2 = t[5];
+  __CPROVER_assert(t_1 == 15, "");
+  __CPROVER_assert(t_2 == 50, "");
+  return 0;
+}

regression/cpp/Function_Overloading3/test.desc

@@ -0,0 +1,8 @@
+CORE
+main.cpp
+
+^EXIT=0$
+^SIGNAL=0$
+--
+^warning: ignoring
+^CONVERSION ERROR$

regression/cpp/Unary_Function_Overload1/test.desc

@@ -1,4 +1,4 @@
-KNOWNBUG
+CORE
 main.cpp
 
 ^EXIT=0$

regression/cpp/Unary_Function_Overload2/test.desc

@@ -1,4 +1,4 @@
-KNOWNBUG
+CORE
 main.cpp
 
 ^EXIT=0$

regression/cpp/Unary_Function_Overload3/test.desc

@@ -1,4 +1,4 @@
-KNOWNBUG
+CORE
 main.cpp
 
 ^EXIT=0$

src/cpp/parse.cpp

@@ -3402,7 +3402,7 @@ bool Parser::rOperatorName(irept &name)
   case '<':
   case '>':
   case ',':
-    operator_id=irep_idt(std::string(static_cast<char>(t), 1));
+    operator_id = std::string(1, static_cast<char>(t));
     break;
 
   case TOK_MULTASSIGN: operator_id="*="; break;