demo/amd/rjs/output/unified/plain-precompiled-build.js
function helperExpression(node) {
	      return node.type === 'SubExpression' || (node.type === 'MustacheStatement' || node.type === 'BlockStatement') && !!(node.params && node.params.length || node.hash);
	    }
function helperExpression(node) {
	      return node.type === 'SubExpression' || (node.type === 'MustacheStatement' || node.type === 'BlockStatement') && !!(node.params && node.params.length || node.hash);
	    }
a mustache is definitely a helper if: * it is an eligible helper, and * it has at least one parameter or hash segment