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go/types: move match function to end of file (cleanup)

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This is a port of CL 363669 from types2 to go/types.

Change-Id: Id1f375ff5708dab528144e30ce16d24d6fdf7d00
Reviewed-on: https://go-review.googlesource.com/c/go/+/364900
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Robert Findley 2021-11-17 19:29:13 -05:00
parent ce7e5013a6
commit 3404ee3e86
1 changed files with 29 additions and 29 deletions
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58
src/go/types/type.go
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@ -27,35 +27,6 @@ func under(t Type) Type {
return t.Underlying()
}
// If x and y are identical, match returns x.
// If x and y are identical channels but for their direction
// and one of them is unrestricted, match returns the channel
// with the restricted direction.
// In all other cases, match returns nil.
func match(x, y Type) Type {
// Common case: we don't have channels.
if Identical(x, y) {
return x
}
// We may have channels that differ in direction only.
if x, _ := x.(*Chan); x != nil {
if y, _ := y.(*Chan); y != nil && Identical(x.elem, y.elem) {
// We have channels that differ in direction only.
// If there's an unrestricted channel, select the restricted one.
switch {
case x.dir == SendRecv:
return y
case y.dir == SendRecv:
return x
}
}
}
// types are different
return nil
}
// If t is not a type parameter, structuralType returns the underlying type.
// If t is a type parameter, structuralType returns the single underlying
// type of all types in its type set if it exists, or nil otherwise. If the
@ -124,3 +95,32 @@ func structuralString(t Type) Type {
}
return nil
}
// If x and y are identical, match returns x.
// If x and y are identical channels but for their direction
// and one of them is unrestricted, match returns the channel
// with the restricted direction.
// In all other cases, match returns nil.
func match(x, y Type) Type {
// Common case: we don't have channels.
if Identical(x, y) {
return x
}
// We may have channels that differ in direction only.
if x, _ := x.(*Chan); x != nil {
if y, _ := y.(*Chan); y != nil && Identical(x.elem, y.elem) {
// We have channels that differ in direction only.
// If there's an unrestricted channel, select the restricted one.
switch {
case x.dir == SendRecv:
return y
case y.dir == SendRecv:
return x
}
}
}
// types are different
return nil
}