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cmd/compile/internal/types2: remove unused position computation (cleanup)

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The position computation was needed for type list support.
With that gone, we don't need this code anymore.

Change-Id: I3f36b3d108a1fae9947fd259d4892e0287cb78ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/358701
Trust: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Robert Griesemer 2021-10-26 13:55:53 -07:00
parent 5c4d7c50c7
commit 6a7eb56cd1
1 changed files with 4 additions and 16 deletions
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20
src/cmd/compile/internal/types2/union.go
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@ -75,28 +75,16 @@ func parseUnion(check *Checker, tlist []syntax.Expr) Type {
continue
}
x := tlist[i]
pos := syntax.StartPos(x)
// We may not know the position of x if it was a typechecker-
// introduced ~T term for a type list entry T. Use the position
// of T instead.
// TODO(gri) remove this test once we don't support type lists anymore
if !pos.IsKnown() {
if op, _ := x.(*syntax.Operation); op != nil {
pos = syntax.StartPos(op.X)
}
}
u := under(t.typ)
f, _ := u.(*Interface)
if t.tilde {
if f != nil {
check.errorf(x, "invalid use of ~ (%s is an interface)", t.typ)
check.errorf(tlist[i], "invalid use of ~ (%s is an interface)", t.typ)
continue // don't report another error for t
}
if !Identical(u, t.typ) {
check.errorf(x, "invalid use of ~ (underlying type of %s is %s)", t.typ, u)
check.errorf(tlist[i], "invalid use of ~ (underlying type of %s is %s)", t.typ, u)
continue // don't report another error for t
}
}
@ -105,14 +93,14 @@ func parseUnion(check *Checker, tlist []syntax.Expr) Type {
// in the beginning. Embedded interfaces with tilde are excluded above. If we reach
// here, we must have at least two terms in the union.
if f != nil && !f.typeSet().IsTypeSet() {
check.errorf(pos, "cannot use %s in union (interface contains methods)", t)
check.errorf(tlist[i], "cannot use %s in union (interface contains methods)", t)
continue // don't report another error for t
}
// Report overlapping (non-disjoint) terms such as
// a|a, a|~a, ~a|~a, and ~a|A (where under(A) == a).
if j := overlappingTerm(terms[:i], t); j >= 0 {
check.softErrorf(pos, "overlapping terms %s and %s", t, terms[j])
check.softErrorf(tlist[i], "overlapping terms %s and %s", t, terms[j])
}
}
})