Binary left shift inside arithmetic dollar

[aljames-a12]

The code with a problem is:

#!/bin/bash

# 1. Normal arithmetic works fine
count=$(( 1 + 1 ))
echo "Count is $count"

# 2. BUG: Binary left shift inside arithmetic expression breaks highlighting
# The parser might be interpreting '<<' as the start of a here-doc, rather than
# a left-shift causing everything following it to be colored as a string.
shift_val=$(( 1 << 4 ))

# 3. The rest of the file is then incorrectly color coded
echo "Shift value is $shift_val"

exit 0

It looks like:

It should look like:

Local grammar changes made to arrive at the above can be provided - though I can not guarantee they do not have additional side effects I have not tested.