Hoogle Search
Within LTS Haskell 24.52 (ghc-9.10.3)
Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.
-
ghc-lib-parser GHC.Parser.Lexer No documentation available.
-
ghc-lib-parser GHC.Parser.Lexer No documentation available.
-
ghc-lib-parser GHC.Parser.Lexer No documentation available.
RequiredTypeArgumentsBit :: ExtBitsghc-lib-parser GHC.Parser.Lexer No documentation available.
-
ghc-lib-parser GHC.Parser.PostProcess No documentation available.
requireLTPuns :: PsErrPunDetails -> Located a -> Located b -> P ()ghc-lib-parser GHC.Parser.PostProcess Emit an error of type PsErrInvalidPun with a location from start to end if the extension ListTuplePuns is disabled. This is used in Parser.y to guard rules that require punning.
warnPrepositiveQualifiedModule :: SrcSpan -> P ()ghc-lib-parser GHC.Parser.PostProcess No documentation available.
-
ghc-lib-parser GHC.Prelude.Basic The value of seq a b is bottom if a is bottom, and otherwise equal to b. In other words, it evaluates the first argument a to weak head normal form (WHNF). seq is usually introduced to improve performance by avoiding unneeded laziness. A note on evaluation order: the expression seq a b does not guarantee that a will be evaluated before b. The only guarantee given by seq is that the both a and b will be evaluated before seq returns a value. In particular, this means that b may be evaluated before a. If you need to guarantee a specific order of evaluation, you must use the function pseq from the "parallel" package.
sequence :: (Traversable t, Monad m) => t (m a) -> m (t a)ghc-lib-parser GHC.Prelude.Basic Evaluate each monadic action in the structure from left to right, and collect the results. For a version that ignores the results see sequence_.
Examples
Basic usage: The first two examples are instances where the input and and output of sequence are isomorphic.>>> sequence $ Right [1,2,3,4] [Right 1,Right 2,Right 3,Right 4]
>>> sequence $ [Right 1,Right 2,Right 3,Right 4] Right [1,2,3,4]
The following examples demonstrate short circuit behavior for sequence.>>> sequence $ Left [1,2,3,4] Left [1,2,3,4]
>>> sequence $ [Left 0, Right 1,Right 2,Right 3,Right 4] Left 0
sequenceA :: (Traversable t, Applicative f) => t (f a) -> f (t a)ghc-lib-parser GHC.Prelude.Basic Evaluate each action in the structure from left to right, and collect the results. For a version that ignores the results see sequenceA_.
Examples
Basic usage: For the first two examples we show sequenceA fully evaluating a a structure and collecting the results.>>> sequenceA [Just 1, Just 2, Just 3] Just [1,2,3]
>>> sequenceA [Right 1, Right 2, Right 3] Right [1,2,3]
The next two example show Nothing and Just will short circuit the resulting structure if present in the input. For more context, check the Traversable instances for Either and Maybe.>>> sequenceA [Just 1, Just 2, Just 3, Nothing] Nothing
>>> sequenceA [Right 1, Right 2, Right 3, Left 4] Left 4