Description

If you go down to the 'let' section of the docs it says

To access the let variables in the pipeline, use the $expr operator.

This is only true inside $match. Other stages can use the let variable as part of any expression.

It would be better worded as something like:

Any stage in the pipeline can access the variable using the $$var syntax, except for $match, where it can only be accessed inside a $expr

Scope of changes

Impact to Other Docs

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