added test multiple subexpressions in a hash with context

[MarkoZabcic]

Here is a failing test for issue #767

[kpdecker]

Thank you so much for the failing test case. This makes things a lot easier :)

We'll look into it and see what might be going on.

[kpdecker]

This appears to be a stack variable overwrite issue.

$ node
> console.log(require('./lib').precompile('{{input aria-label=(t item.field) placeholder=(t item.placeholder)}}'))
{"compiler":[5,">= 2.0.0"],"main":function(depth0,helpers,partials,data) {
  var stack1, stack2, helper, helperMissing=helpers.helperMissing, escapeExpression=this.escapeExpression;
  stack1 = (helper = helpers.t || (depth0 && depth0.t) || helperMissing,helper.call(depth0, ((stack1 = (depth0 && depth0.item)),stack1 == null || stack1 === false ? stack1 : stack1.field), {"name":"t","hash":{},"data":data}));
  stack2 = (helper = helpers.t || (depth0 && depth0.t) || helperMissing,helper.call(depth0, ((stack1 = (depth0 && depth0.item)),stack1 == null || stack1 === false ? stack1 : stack1.placeholder), {"name":"t","hash":{},"data":data}));
  return escapeExpression((helper = helpers.input || (depth0 && depth0.input) || helperMissing,helper.call(depth0, {"name":"input","hash":{
    'placeholder': (stack2),
    'aria-label': (stack1)
  },"data":data})));
  },"useData":true}

This is failing under master so it appears that we have not resolved all of the stack variable issues.