Annotate unreachable comment-scanner switch paths to satisfy C26819 (nlohmann#5071)

Author: nlohmann

include/nlohmann/detail/input/lexer.hpp

@@ -863,6 +863,8 @@ class lexer : public lexer_base<BasicJsonType>
                             break;
                     }
                 }
+
+                JSON_HEDLEY_UNREACHABLE();
             }
 
             // multi-line comments skip input until */ is read
@@ -898,6 +900,8 @@ class lexer : public lexer_base<BasicJsonType>
                             continue;
                     }
                 }
+
+                JSON_HEDLEY_UNREACHABLE();
             }
 
             // unexpected character after reading '/'

single_include/nlohmann/json.hpp

@@ -8055,6 +8055,8 @@ class lexer : public lexer_base<BasicJsonType>
                             break;
                     }
                 }
+
+                JSON_HEDLEY_UNREACHABLE();
             }
 
             // multi-line comments skip input until */ is read
@@ -8090,6 +8092,8 @@ class lexer : public lexer_base<BasicJsonType>
                             continue;
                     }
                 }
+
+                JSON_HEDLEY_UNREACHABLE();
             }
 
             // unexpected character after reading '/'