Name of the lexer
Swift

Code sample
A sample of the code that produces the bug.

funcWithLambdaArg { x in x + 5 }
funcWithLambdaArg { $0 + 5 }
funcWithLambdaArg({ x in x + 5 })

Screenshots

Additional context
It may not be possible to tokenise the identifier funcWithLambdaArg when a lambda is the only argument because of other possibilities (I'm not familiar enough with Swift to know whether this is the case or not).

What do you think @johnfairh / @lordcodes?