This kata does not perform normal brace matching: it considers [) a brace match that is invalid. In any normal brace matching if braces are unmatched it just goes till the end.

The kata's brace matching behaviour is flawed anyway as it will fail to cases like [)].

(Also, the kata does not specify what are considered open/close brace characters, which are [({ and ])} respectively.)

There are no random tests.

tests/Fixture.cs(152,49): error CS1061: 'Brace' does not contain a definition for '_InnerBraces' and no accessible extension method '_InnerBraces' accepting a first argument of type 'Brace' could be found (are you missing a using directive or an assembly reference?)