Problem:    Vim9: using illegal pointer with inline function inside a lambda.
Solution:   Clear eval_tofree_cmdline when advancing to the next line.
            (closes #8578)

Problem:    Vim9: cannot handle nested inline function.
Solution:   Check for nested inline function. (closes #8575)

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: no error when using type with unknown number of arguments.
Solution:   Do not ignore argument count of -1. (closes #8492)

Problem:    Vim9: default argument expression cannot use previous argument
Solution:   Correct argument index. (closes #8496)

Problem:    Vim9: cannot use ternary operator in parenthesis.
Solution:   Do not use "=~" for a default argument value.  (closes #8462)

Problem:    Vim9: cannot use ternary operator in parenthesis.
Solution:   Do not use "==" for a default argument value.  (closes #8462)

Problem:    Vim9: using default value in lambda gives confusing error.
Solution:   Pass "default_args" on the first pass to get the arguments.
            (closes #8455)

Problem:    Vim9: "legacy call" does not work.
Solution:   Do not skip "call" after "legacy". (closes #8454)

Problem:    Vim9: crash when calling :def function with partial and return
            type is not set.
Solution:   When the return type is not set handle like the return type is
            unknown. (closes #8422)