The ident had parenthesis Example: let (|Odd|Even|) = ... The active pattern ident will be "|Odd|Even|", while originally there were parenthesis.

The ident originally had a different notation. Example: a + b The operator ident will be compiled into "op_Addition", while the original notation was "+"

The ident originally had a different notation and parenthesis Example: let (>=>) a b = ... The operator ident will be compiled into "op_GreaterEqualsGreater", while the original notation was ">=>" and had parenthesis