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{-# LANGUAGE LambdaCase #-}
{-# OPTIONS_GHC -Wno-orphans #-} -- instance Outputable GhcHint
module GHC.Types.Hint.Ppr (
perhapsAsPat
-- also, and more interesting: instance Outputable GhcHint
) where
import GHC.Prelude
import GHC.Parser.Errors.Basic
import GHC.Types.Hint
import GHC.Hs.Expr () -- instance Outputable
import GHC.Types.Id
import GHC.Utils.Outputable
import qualified GHC.LanguageExtensions as LangExt
instance Outputable GhcHint where
ppr = \case
UnknownHint m
-> ppr m
SuggestExtension ext
-> case ext of
LangExt.NegativeLiterals
-> text "If you are trying to write a large negative literal, use NegativeLiterals"
_ -> text "Perhaps you intended to use" <+> ppr ext
SuggestMissingDo
-> text "Possibly caused by a missing 'do'?"
SuggestLetInDo
-> text "Perhaps you need a 'let' in a 'do' block?"
$$ text "e.g. 'let x = 5' instead of 'x = 5'"
SuggestAddSignatureCabalFile pi_mod_name
-> text "Try adding" <+> quotes (ppr pi_mod_name)
<+> text "to the"
<+> quotes (text "signatures")
<+> text "field in your Cabal file."
SuggestSignatureInstantiations pi_mod_name suggestions
-> let suggested_instantiated_with =
hcat (punctuate comma $
[ ppr k <> text "=" <> ppr v
| InstantiationSuggestion k v <- suggestions
])
in text "Try passing -instantiated-with=\"" <>
suggested_instantiated_with <> text "\"" $$
text "replacing <" <> ppr pi_mod_name <> text "> as necessary."
SuggestUseSpaces
-> text "Please use spaces instead."
SuggestUseWhitespaceAfter sym
-> text "Add whitespace after the"
<+> quotes (pprOperatorWhitespaceSymbol sym) <> char '.'
SuggestUseWhitespaceAround sym _occurrence
-> text "Add whitespace around" <+> quotes (text sym) <> char '.'
SuggestParentheses
-> text "Use parentheses."
SuggestIncreaseMaxPmCheckModels
-> text "Increase the limit or resolve the warnings to suppress this message."
SuggestAddTypeSignature
-> text "Add a type signature."
SuggestBindToWildcard rhs
-> hang (text "Suppress this warning by saying") 2 (quotes $ text "_ <-" <+> ppr rhs)
SuggestAddInlineOrNoInlinePragma lhs_id rule_act
-> vcat [ text "Add an INLINE[n] or NOINLINE[n] pragma for" <+> quotes (ppr lhs_id)
, whenPprDebug (ppr (idInlineActivation lhs_id) $$ ppr rule_act)
]
SuggestAddPhaseToCompetingRule bad_rule
-> vcat [ text "Add phase [n] or [~n] to the competing rule"
, whenPprDebug (ppr bad_rule) ]
SuggestIncreaseSimplifierIterations
-> text "Set limit with -fconstraint-solver-iterations=n; n=0 for no limit"
SuggestUseTypeFromDataKind
-> text "Use" <+> quotes (text "Type")
<+> text "from" <+> quotes (text "Data.Kind") <+> text "instead."
SuggestQualifiedAfterModuleName
-> text "Place" <+> quotes (text "qualified")
<+> text "after the module name."
SuggestThQuotationSyntax
-> vcat [ text "Perhaps you intended to use quotation syntax of TemplateHaskell,"
, text "but the type variable or constructor is missing"
]
SuggestRoles nearby
-> case nearby of
[] -> empty
[r] -> text "Perhaps you meant" <+> quotes (ppr r)
-- will this last case ever happen??
_ -> hang (text "Perhaps you meant one of these:")
2 (pprWithCommas (quotes . ppr) nearby)
SuggestQualifyStarOperator
-> text "To use (or export) this operator in"
<+> text "modules with StarIsType,"
$$ text " including the definition module, you must qualify it."
SuggestTypeSignatureForm
-> text "A type signature should be of form <variables> :: <type>"
perhapsAsPat :: SDoc
perhapsAsPat = text "Perhaps you meant an as-pattern, which must not be surrounded by whitespace"
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