exp/template: change the name from 'metacharacter' to 'delimiter',
because that's what they are.
No semantic change.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4675060
diff --git a/src/pkg/exp/template/parse_test.go b/src/pkg/exp/template/parse_test.go
index 34b0da6..71580f8 100644
--- a/src/pkg/exp/template/parse_test.go
+++ b/src/pkg/exp/template/parse_test.go
@@ -140,7 +140,7 @@
 		`[(text: " \t\n")]`},
 	{"text", "some text", noError,
 		`[(text: "some text")]`},
-	{"emptyMeta", "{{}}", hasError,
+	{"emptyAction", "{{}}", hasError,
 		`[(action: [])]`},
 	{"field", "{{.X}}", noError,
 		`[(action: [(command: [F=[X]])])]`},