Broken syntax highlighting for PHP closures returning references

[alkihis]

• VSCode Version: 1.28.2
• OS Version: macOS Mojave 10.14.1

Syntax highlighting for closures (anonymous functions) who returns references is broken.

Steps to Reproduce:

1. Create anonymous function with "&" between "function" keyword and argument list

Does this issue occur when all extensions are disabled?: Yes

[alexr00]

This issue was moved to atom/language-php#343

[alexr00]

We pull our PHP grammar from atom/language-php. Since this appears to be an issue with that grammar I've moved the issue to that repo. Thanks for reporting!