Bug: Missing source map for variable inside optional?.chaining operator

[phil294]

Bug report

Input Code

This shows the source maps the compiler returns for this line. Notice that the variable (old_presences in that case) is not being pointed at.

Expected Behavior

Another source map from old_presences to old_presences

Context

This is not problematic for normal users, but for IntelliSense from the CoffeeSense LSP it would be necessary, as currently go-tos etc. are impossible around optional chaining vars.

That said, the source maps have been amazing otherwise. They are usually highly detailed and accurate so that I could successfully base the entire extension logic on them.

Environment

• CoffeeScript version: 2.6.1
• Node.js version: 16.16.0