x/tools/gopls/internal/test/marker: Test/quickfix/undeclared/undeclared_variable.txt failures

#!watchflakes
default <- pkg == "golang.org/x/tools/gopls/internal/test/marker" && test == "Test/quickfix/undeclared/undeclared_variable.txt"

Issue created automatically to collect these failures.

Example (log):

=== RUN   Test/quickfix/undeclared/undeclared_variable.txt
=== PAUSE Test/quickfix/undeclared/undeclared_variable.txt

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