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package hm
import (
"fmt"
"github.com/pkg/errors"
)
// TypeVariable is a variable that ranges over the types - that is to say it can take any type.
type TypeVariable rune
func (t TypeVariable) Name() string { return string(t) }
func (t TypeVariable) Apply(sub Subs) Substitutable {
if sub == nil {
return t
}
if retVal, ok := sub.Get(t); ok {
return retVal
}
return t
}
func (t TypeVariable) FreeTypeVar() TypeVarSet { tvs := BorrowTypeVarSet(1); tvs[0] = t; return tvs }
func (t TypeVariable) Normalize(k, v TypeVarSet) (Type, error) {
if i := k.Index(t); i >= 0 {
return v[i], nil
}
return nil, errors.Errorf("Type Variable %v not in signature", t)
}
func (t TypeVariable) Types() Types { return nil }
func (t TypeVariable) String() string { return string(t) }
func (t TypeVariable) Format(s fmt.State, c rune) { fmt.Fprintf(s, "%c", rune(t)) }
func (t TypeVariable) Eq(other Type) bool { return other == t }
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