| Safe Haskell | Safe-Inferred |
|---|---|
| Language | Haskell2010 |
GHC.Tc.Errors
Contents
Synopsis
- reportUnsolved :: WantedConstraints -> TcM (Bag EvBind)
- reportAllUnsolved :: WantedConstraints -> TcM ()
- warnAllUnsolved :: WantedConstraints -> TcM ()
- warnDefaulting :: TcTyVar -> [Ct] -> Type -> TcM ()
- solverReportMsg_ExpectedActuals :: TcSolverReportMsg -> [(Type, Type)]
- solverReportInfo_ExpectedActuals :: TcSolverReportInfo -> [(Type, Type)]
Documentation
reportUnsolved :: WantedConstraints -> TcM (Bag EvBind) Source #
Report unsolved goals as errors or warnings. We may also turn some into deferred run-time errors if `-fdefer-type-errors` is on.
reportAllUnsolved :: WantedConstraints -> TcM () Source #
Report *all* unsolved goals as errors, even if -fdefer-type-errors is on However, do not make any evidence bindings, because we don't have any convenient place to put them. NB: Type-level holes are OK, because there are no bindings. See Note [Deferring coercion errors to runtime] Used by solveEqualities for kind equalities (see Note [Fail fast on kind errors] in GHC.Tc.Solver)
warnAllUnsolved :: WantedConstraints -> TcM () Source #
Report all unsolved goals as warnings (but without deferring any errors to run-time). See Note [Safe Haskell Overlapping Instances Implementation] in GHC.Tc.Solver
GHC API helper functions
solverReportMsg_ExpectedActuals :: TcSolverReportMsg -> [(Type, Type)] Source #
If the TcSolverReportMsg is a type mismatch between
an actual and an expected type, return the actual and expected types
(in that order).
Prefer using this over manually inspecting the TcSolverReportMsg datatype
if you just want this information, as the datatype itself is subject to change
across GHC versions.
solverReportInfo_ExpectedActuals :: TcSolverReportInfo -> [(Type, Type)] Source #
Retrieves all "expected"/"actual" messages from a TcSolverReportInfo.
Prefer using this over inspecting the TcSolverReportInfo datatype if
you just need this information, as the datatype itself is subject to change
across GHC versions.