Problem:    Vim9: nested autoload call error overruled by "Unknown error".
Solution:   Check need_rethrow before giving an "Unknown error".
            (closes #8568)

Problem:    Vim9: profiling fails if nested function is also profiled.
Solution:   Use the compile type from the outer function. (closes #8543)

Problem:    Vim9: profiling does not work with a nested function.
Solution:   Also compile a nested function without profiling. (closes #8543)
            Handle that compiling may cause the table of compiled functions to
            change.

Problem:    Vim9: line number wrong for :execute argument.
Solution:   Use the line number of the :execute command itself. (closes #8537)

Problem:    Vim9: profile test fails without profile feature.
Solution:   Check the profile feature is present.

Problem:    Vim9: A lambda may be compiled with the wrong context if it is
            called from a profiled function.
Solution:   Compile the lambda with and without profiling. (closes #8543)

Problem:    Vim9: no error when a line only has a variable name.
Solution:   Give an error when an expression is evaluated without an effect.
            (closes #8538)

Problem:    Vim9: import test fails.
Solution:   Rename directory back to "import", use "p" to avoid an error when
            the directory already exists.

Problem:    Vim9: imported uninitialized list does not get type checked.
Solution:   Get type from imported variable.

Problem:    Vim9: for loop error reports wrong line number.
Solution:   Save and restore the line number when evaluating the expression.
            (closes #8514)