String -> ByteString -mtl -bytestring

error :: [Char] -> a
base Prelude
error stops execution and displays an error message.
trace :: String -> a -> a
base Debug.Trace
When called, trace outputs the string in its first argument, before returning the second argument as its result. The trace function is not referentially transparent, and should only be used for debugging, or for monitoring execution. Some implementations of trace may decorate the string that's output to indicate that you're tracing. The function is implemented on top of putTraceMsg.
buf_fromStr :: BufferOp a -> String -> a
HTTP Network.BufferType
read :: Read a => String -> a
base Prelude, base Text.Read
The read function reads input from a string, which must be completely consumed by the input process.
fromString :: IsString a => String -> a
base Data.String, base GHC.Exts
strMsg :: Error a => String -> a
transformers Control.Monad.Trans.Error, mtl Control.Monad.Error.Class, mtl Control.Monad.Error
printf :: PrintfType r => String -> r
base Text.Printf
Format a variable number of arguments with the C-style formatting string. The return value is either String or (IO a). The format string consists of ordinary characters and /conversion specifications/, which specify how to format one of the arguments to printf in the output string. A conversion specification begins with the character %, followed by one or more of the following flags: > - left adjust (default is right adjust) > + always use a sign (+ or -) for signed conversions > 0 pad with zeroes rather than spaces followed optionally by a field width: > num field width > * as num, but taken from argument list followed optionally by a precision: > .num precision (number of decimal places) and finally, a format character: > c character Char, Int, Integer, ... > d decimal Char, Int, Integer, ... > o octal Char, Int, Integer, ... > x hexadecimal Char, Int, Integer, ... > X hexadecimal Char, Int, Integer, ... > u unsigned decimal Char, Int, Integer, ... > f floating point Float, Double > g general format float Float, Double > G general format float Float, Double > e exponent format float Float, Double > E exponent format float Float, Double > s string String Mismatch between the argument types and the format string will cause an exception to be thrown at runtime. Examples: > > printf "%d\n" (23::Int) > 23 > > printf "%s %s\n" "Hello" "World" > Hello World > > printf "%.2f\n" pi > 3.14
throwErrno :: String -> IO a
base Foreign.C.Error
Throw an IOError corresponding to the current value of getErrno.
badIO :: String -> IO a
template-haskell Language.Haskell.TH.Syntax
throwSocketError :: String -> IO a
network Network.Socket.Internal
Throw an IOError corresponding to the current socket error.
fail :: Monad m => String -> m a
base Prelude, base Control.Monad, base Control.Monad.Instances
hPrintf :: HPrintfType r => Handle -> String -> r
base Text.Printf
Similar to printf, except that output is via the specified Handle. The return type is restricted to (IO a).
ReqArg :: (String -> a) -> String -> ArgDescr a
base System.Console.GetOpt
option requires argument
OptArg :: (Maybe String -> a) -> String -> ArgDescr a
base System.Console.GetOpt
optional argument
throwSocketErrorCode :: String -> CInt -> IO a
network Network.Socket.Internal
Like throwSocketError, but the error code is supplied as an argument. On Windows, do not use errno. Use a system error code instead.
withProgName :: String -> IO a -> IO a
base System.Environment
withProgName name act - while executing action act, have getProgName return name.
ParseFailed :: SrcLoc -> String -> ParseResult a
haskell-src Language.Haskell.ParseMonad, haskell-src Language.Haskell.Parser
The parse failed at the specified source location, with an error message.
runParser :: P a -> String -> ParseResult a
haskell-src Language.Haskell.ParseMonad
setRequestVersion :: String -> Request a -> Request a
HTTP Network.HTTP.Base
setRequestVersion v req returns a new request, identical to req, but with its HTTP version set to v.
setResponseVersion :: String -> Response a -> Response a
HTTP Network.HTTP.Base
setResponseVersion v rsp returns a new response, identical to rsp, but with its HTTP version set to v.

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