null package:ghc

Is the map empty?

Data.Word64Map.null (empty)           == True
Data.Word64Map.null (singleton 1 'a') == False

Is the set empty?

Returns True if the FastString is empty

The empty JS statement

The JS literal null

Is this set empty?

The identity monad as a VizCollapseMonad. Use this monad when you want efficiency in graph collapse.

Return whether this DataCon's worker, in its Core representation, takes any value arguments. In particular, remember that we include coercion arguments in the arity of the Core representation of the DataCon -- both lifted and unlifted coercions, despite the latter having zero-width runtime representation. See also Note [DataCon arities].

Return whether there are any argument types for this DataCons original source type See Note [DataCon arities]

A pre-allocated TyConApp tycon []