text/template: catch unmatched right delimiter
It was simply a missing error case: when scanning plain text
outside of an action, a right delimiter should be an error.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/13468045
diff --git a/src/pkg/text/template/parse/parse_test.go b/src/pkg/text/template/parse/parse_test.go
index c35f4ac..049e65c 100644
--- a/src/pkg/text/template/parse/parse_test.go
+++ b/src/pkg/text/template/parse/parse_test.go
@@ -312,7 +312,7 @@
 	{"spaces only", " \t\n \t\n", true},
 	{"definition", `{{define "x"}}something{{end}}`, true},
 	{"definitions and space", "{{define `x`}}something{{end}}\n\n{{define `y`}}something{{end}}\n\n", true},
-	{"definitions and text", "{{define `x`}}something{{end}}\nx\n{{define `y`}}something{{end}}\ny\n}}", false},
+	{"definitions and text", "{{define `x`}}something{{end}}\nx\n{{define `y`}}something{{end}}\ny\n", false},
 	{"definition and action", "{{define `x`}}something{{end}}{{if 3}}foo{{end}}", false},
 }