Dynamically xfail test case which fails on CI

This is a stop-gap measure for GH-15709 to keep CI green.

Sorry, xfailed the wrong test case previously.

Fix lineno in function redeclaration error

We were previously using the lineno of the first instruction, rather than the
start of the function itself.

Fixes GH-16509
Closes

Fix lineno in function redeclaration error

We were previously using the lineno of the first instruction, rather than the
start of the function itself.

Fixes GH-16509
Closes GH-16531

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