src/mustache_core.js
function(expressionString, state){
		expressionString = expressionString.trim();
		var exprData,
				partialName = expressionString.split(/\s+/).shift();

		if(partialName !== expressionString) {
			exprData = core.expression.parse(expressionString);
		}

		return function(scope, parentSectionNodeList){
			//!steal-remove-start
			if (process.env.NODE_ENV !== 'production') {
				scope.set('scope.filename', state.filename);
				scope.set('scope.lineNumber', state.lineNo);
			}
			//!steal-remove-end
			var nodeList = [this];
			nodeList.expression = ">" + partialName;
			nodeLists.register(nodeList, null, parentSectionNodeList || true, state.directlyNested);

			var partialFrag = new Observation(function(){
				var localPartialName = partialName;
				var partialScope = scope;
				// If the second parameter of a partial is a custom context
				if(exprData && exprData.argExprs.length === 1) {
					var newContext = canReflect.getValue( exprData.argExprs[0].value(scope) );
					if(typeof newContext === "undefined") {
						//!steal-remove-start
						if (process.env.NODE_ENV !== 'production') {
							dev.warn('The context ('+ exprData.argExprs[0].key +') you passed into the' +
								'partial ('+ partialName +') is not defined in the scope!');
						}
						//!steal-remove-end
					}else{
						partialScope = scope.add(newContext);
					}
				}
				// Look up partials in templateContext first
				var partial = canReflect.getKeyValue(partialScope.templateContext.partials, localPartialName);
				var renderer;

				if (partial) {
					renderer = function() {
						return partial.render ? partial.render(partialScope, nodeList)
							: partial(partialScope);
					};
				}
				// Use can.view to get and render the partial.
				else {
					var scopePartialName = partialScope.read(localPartialName, {
						isArgument: true
					}).value;

					if (scopePartialName === null || !scopePartialName && localPartialName[0] === '*') {
						return frag("");
					}
					if (scopePartialName) {
						localPartialName = scopePartialName;
					}

					renderer = function() {
						if(typeof localPartialName === "function"){
							return localPartialName(partialScope, {}, nodeList);
						} else {
							var domRenderer = core.getTemplateById(localPartialName);
							//!steal-remove-start
							if (process.env.NODE_ENV !== 'production') {
								if (!domRenderer) {
									dev.warn(
										(state.filename ? state.filename + ':' : '') +
										(state.lineNo ? state.lineNo + ': ' : '') +
										'Unable to find partial "' + localPartialName + '".');
								}
							}
							//!steal-remove-end
							return domRenderer ? domRenderer(partialScope, {}, nodeList) : getDocument().createDocumentFragment();
						}
					};
				}
				var res = ObservationRecorder.ignore(renderer)();
				return frag(res);
			});
			canReflect.setPriority(partialFrag,nodeList.nesting );

			live.html(this, partialFrag, this.parentNode, nodeList);
		};
	}
function(expressionString, state){
		expressionString = expressionString.trim();
		var exprData,
				partialName = expressionString.split(/\s+/).shift();

		if(partialName !== expressionString) {
			exprData = core.expression.parse(expressionString);
		}

		return function(scope, parentSectionNodeList){
			//!steal-remove-start
			if (process.env.NODE_ENV !== 'production') {
				scope.set('scope.filename', state.filename);
				scope.set('scope.lineNumber', state.lineNo);
			}
			//!steal-remove-end
			var nodeList = [this];
			nodeList.expression = ">" + partialName;
			nodeLists.register(nodeList, null, parentSectionNodeList || true, state.directlyNested);

			var partialFrag = new Observation(function(){
				var localPartialName = partialName;
				var partialScope = scope;
				// If the second parameter of a partial is a custom context
				if(exprData && exprData.argExprs.length === 1) {
					var newContext = canReflect.getValue( exprData.argExprs[0].value(scope) );
					if(typeof newContext === "undefined") {
						//!steal-remove-start
						if (process.env.NODE_ENV !== 'production') {
							dev.warn('The context ('+ exprData.argExprs[0].key +') you passed into the' +
								'partial ('+ partialName +') is not defined in the scope!');
						}
						//!steal-remove-end
					}else{
						partialScope = scope.add(newContext);
					}
				}
				// Look up partials in templateContext first
				var partial = canReflect.getKeyValue(partialScope.templateContext.partials, localPartialName);
				var renderer;

				if (partial) {
					renderer = function() {
						return partial.render ? partial.render(partialScope, nodeList)
							: partial(partialScope);
					};
				}
				// Use can.view to get and render the partial.
				else {
					var scopePartialName = partialScope.read(localPartialName, {
						isArgument: true
					}).value;

					if (scopePartialName === null || !scopePartialName && localPartialName[0] === '*') {
						return frag("");
					}
					if (scopePartialName) {
						localPartialName = scopePartialName;
					}

					renderer = function() {
						if(typeof localPartialName === "function"){
							return localPartialName(partialScope, {}, nodeList);
						} else {
							var domRenderer = core.getTemplateById(localPartialName);
							//!steal-remove-start
							if (process.env.NODE_ENV !== 'production') {
								if (!domRenderer) {
									dev.warn(
										(state.filename ? state.filename + ':' : '') +
										(state.lineNo ? state.lineNo + ': ' : '') +
										'Unable to find partial "' + localPartialName + '".');
								}
							}
							//!steal-remove-end
							return domRenderer ? domRenderer(partialScope, {}, nodeList) : getDocument().createDocumentFragment();
						}
					};
				}
				var res = ObservationRecorder.ignore(renderer)();
				return frag(res);
			});
			canReflect.setPriority(partialFrag,nodeList.nesting );

			live.html(this, partialFrag, this.parentNode, nodeList);
		};
	}
## mustacheCore.makeLiveBindingPartialRenderer Returns a renderer function that live binds a partial. 
@hide
Returns a renderer function that live binds a partial.
@param {String} expressionString
@param {Object} state The html state of where the expression was found.
@return {function(this:HTMLElement,can-view-scope,can.view.Options)} A renderer function
live binds a partial.