E0450: misleading use of ',' operator in index
Using comma operator within an indexing operation is misleading, as it can be confused with a new array definition, or with access to multiple elements of the container.
Here, the value of
topLeft will be equal to
matrix = [1, 2, 3].
If the intention is to find the value at the top-left corner of
matrix, the correct syntax would be:
Documentation for other errors