Add try

Updates #9737

tpl/templates/templates_integration_test.go

@@ -93,3 +93,37 @@ Home: true
 
 `)
 }
+
+func TestTry(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- config.toml --
+baseURL = 'http://example.com/'
+-- layouts/index.html --
+Home.
+{{ $g :=  try ("hello = \"Hello Hugo\"" | transform.Unmarshal)   }}
+{{ with $g.Err }}
+Err1: {{ . }}
+{{ else }}
+Value1: {{ $g.Value.hello | safeHTML }}|
+{{ end }}
+{{ $g :=  try ("hello != \"Hello Hugo\"" | transform.Unmarshal)   }}
+{{ with $g.Err }}
+Err2: {{ . | safeHTML }}
+{{ else }}
+Value2: {{ $g.Value.hello | safeHTML }}|
+{{ end }}
+Try upper: {{ (try ("hello" | upper)).Value }}
+Try printf: {{ (try (printf "hello %s" "world")).Value }}
+`
+
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/index.html",
+		"Value1: Hello Hugo|",
+		"Err2: template: index.html:",
+		"Try upper: HELLO",
+		"Try printf: hello world",
+	)
+}