I encountered a problem with the multiplication symbol in F#.
In F# multiline comments are of the form ( … )
Sadly the syntax highlighter also recognizes the following code as the start of a multiline comment:
List.map2 (*) [1; 2; 3] [4; 5; 6]
The compiler is not bothered by this. It just destroys the syntax highlighting, which is a bit annoying.