| WpLam Var -- \d. [] the 'd' is a type-class dictionary or coercion variable
| WpTyLam TyVar -- \a. [] the 'a' is a type variable (not coercion var)
| WpInline -- inline_me [] Wrap inline around the thing
| WpLam Var -- \d. [] the 'd' is a type-class dictionary or coercion variable
| WpTyLam TyVar -- \a. [] the 'a' is a type variable (not coercion var)
| WpInline -- inline_me [] Wrap inline around the thing