Adjust assignment line number for match

Otherwise the assignment will have the same number as the default arm
which will 1. mis-trigger a breakpoint and 2. mark the line as covered
e

Adjust assignment line number for match

Otherwise the assignment will have the same number as the default arm
which will 1. mis-trigger a breakpoint and 2. mark the line as covered
even when it isn't.

Closes GH-6083

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