Documentation

mkClassDecl builds a RdrClassDecl, filling in the names for tycon and datacon by deriving them from the name of the class. We fill in the names for the tycon and datacon corresponding to the class, by deriving them from the name of the class itself. This saves recording the names in the interface file (which would be equally good).

This rather gruesome function is used mainly by the parser. When parsing:

data T a = T | T1 Int

we parse the data constructors as types because of parser ambiguities, so then we need to change the type constr to a data constr

The exact-name case can occur when parsing:

data [] a = [] | a : [a]

For the exact-name case we return an original name.

Function definitions are restructured here. Each is assumed to be recursive initially, and non recursive definitions are discovered by the dependency analyser.

Yield a parse error if we have a function applied directly to a do block etc. and BlockArguments is not enabled.

Validate the context constraints and break up a context into a list of predicates.

    (Eq a, Ord b)        -->  [Eq a, Ord b]
    Eq a                 -->  [Eq a]
    (Eq a)               -->  [Eq a]
    (((Eq a)))           -->  [Eq a]

Given a type that is a field to an infix data constructor, try to split off a trailing docstring on the type, and check that there are no other docstrings.

Check if the gadt_constrlist is empty. Only raise parse error for `data T where` to avoid affecting existing error message, see #8258.

Hint about bang patterns, assuming BangPatterns is off.

Transform a list of atype with strict_mark into HsOpTy's of eqTyCon_RDR:

~a, ~b, c, ~d

==> (~a) ~ ((b c) ~ d)

See Note [Parsing ~]

Either an operator or an operand.

Merge a reversed and non-empty soup of operators and operands into a type.

User input: F x y + G a b * X Input to mergeOps: [X, *, b, a, G, +, y, x, F] Output corresponds to what the user wrote assuming all operators are of the same fixity and right-associative.

It's a bit silly that we're doing it at all, as the renamer will have to rearrange this, and it'd be easier to keep things separate.