Shellscript syntax issues when case clauses are terminated with ;& or ;;&

[alexr00]

The code with a problem is:

#!/usr/bin/env bash

case 'yes' in 
    yes)
        echo 'yes'
        ;& # Fall through
    *)
        echo 'default'
        ;;
esac

It looks like:

It should look like:

According to the Bash Reference Manual, a case clause must be terminated with ;;, ;&, or ;;&. Currently, the shellscript grammar only supports ;;. Using ;& or ;;& affects the coloring of subsequent comments or clause patterns.

Originally from @rhenescu in https://github.com/microsoft/vscode/issues/192701