cmd/compile/internal/syntax: accept "~" and "|" interface elements

Type lists continue to be accepted as before.

While at it, print missing filenames in error tests
(which uses an ad-hoc position representation).

Change-Id: I933b3acbc9cf1985ad8f70f6b206e3a1dbd64d1e
Reviewed-on: https://go-review.googlesource.com/c/go/+/307371
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/cmd/compile/internal/syntax/error_test.go b/src/cmd/compile/internal/syntax/error_test.go
index 919667f1d3..e4bedf54fd 100644
--- a/src/cmd/compile/internal/syntax/error_test.go
+++ b/src/cmd/compile/internal/syntax/error_test.go
@@ -164,7 +164,7 @@ func testSyntaxErrors(t *testing.T, filename string) {
 			// we have a match - eliminate this error
 			delete(declared, pos)
 		} else {
-			t.Errorf("%s: unexpected error: %s", orig, e.Msg)
+			t.Errorf("%s:%s: unexpected error: %s", filename, orig, e.Msg)
 		}
 	}, nil, mode)
 
@@ -175,7 +175,7 @@ func testSyntaxErrors(t *testing.T, filename string) {
 
 	// report expected but not reported errors
 	for pos, pattern := range declared {
-		t.Errorf("%s: missing error: %s", pos, pattern)
+		t.Errorf("%s:%s: missing error: %s", filename, pos, pattern)
 	}
 }