ghc-9.4.0.20220721: The GHC API
Safe HaskellSafe-Inferred
LanguageHaskell2010

GHC.Tc.Validity

Synopsis

Documentation

checkValidTyFamEqn Source #

Arguments

:: TyCon

of the type family

-> [Var]

Bound variables in the equation

-> [Type]

Type patterns

-> Type

Rhs

-> TcM () 

Do validity checks on a type family equation, including consistency with any enclosing class instance head, termination, and lack of polytypes.

checkValidAssocTyFamDeflt Source #

Arguments

:: TyCon

of the type family

-> [Type]

Type patterns

-> TcM () 

Checks that an associated type family default:

  1. Only consists of arguments that are bare type variables, and
  2. Has a distinct type variable in each argument.

See Note [Type-checking default assoc decls] in GHC.Tc.TyCl.

checkConsistentFamInst Source #

Arguments

:: AssocInstInfo 
-> TyCon

Family tycon

-> CoAxBranch 
-> TcM ()