When i use the func, map slice as the key of map, it isn't work!
So I lookup source why, i find
// spec: "The comparison operators == and != must be fully defined
// for operands of the key type; thus the key type must not be a
// function, map, or slice."
//
// Delay this check because it requires fully setup types;
// it is safe to continue in any case (was issue 6667).
check.later(func() {
if !Comparable(typ.key) {
check.errorf(e.Key.Pos(), "invalid map key type %s",
typ.key)
}
})
// Comparable reports whether values of type T are comparable.
func Comparable(T Type) bool {
switch t := T.Underlying().(type) {
case *Basic:
// assume invalid types to be comparable
// to avoid follow-up errors
return t.kind != UntypedNil
case *Pointer, *Interface, *Chan:
return true
case *Struct:
for _, f := range t.fields {
if !Comparable(f.typ) {
return false
}
}
return true
case *Array:
return Comparable(t.elem)
}
return false
}
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