From @BinaryInk on December 2, 2015 22:2

When using the goto keyword, it is not highlighted, nor is the label selected.

Example:

function func()
     if this == that then
          do = this
          goto continueHere
     elseif this2 == that2 then
          ::continueHere::
     end
end

Ignoring the terrible example itself, the problem occurs on line 4 where no highlighting will occur. Line 6, where the label is, highlights correctly, however.

Copied from original issue: microsoft/vscode#942