Problem:    Vim9: line continuation in lambda doesn't always work.
Solution:   Do not use a local evalarg unless there isn't one. (closes #6439)

Problem:    Vim9: no check for whitespace after comma in lambda.
Solution:   Give error if white space is missing.

Problem:    Vim9: not enough type checking in Vim9 script.
Solution:   Use same type checking as in a :def function.

Problem:    Vim9: Cannot split a line before ".member".
Solution:   Check for ".member" after line break.

Problem:    Vim9: builtin function method call only supports first argument.
Solution:   Shift arguments when needed. (closes #6305, closes #6419)

Problem:    Vim9: no error for missing space after a comma.
Solution:   Check for white space.

Problem:    Vim9: No error for invalid command in compiled function.
Solution:   Handle CMD_SIZE.

Problem:    Vim9: getting a dict member may not work.
Solution:   Clear the dict only after copying the item.

Problem:    Vim9: getting a list member may not work.
Solution:   Clear the list only after copying the item. (closes #6393)

Problem:    Vim9: getting a dict member may not work.
Solution:   Clear the dict only after copying the item. (closes #6390)

Problem:    Vim9: line continuation in dict member not recognized.
Solution:   Check for line continuation.

Problem:    Vim9: no line continuation allowed in method call.
Solution:   Handle line continuation in expression before method call.

Problem:    Vim9: line continuation does not work in function arguments.
Solution:   Pass "evalarg" to get_func_tv().  Fix seeing double quoted string
            as comment.

Problem:    Vim9: no line break allowed after some operators.
Solution:   Skip a line break after the operator.  Add
            eval_may_get_next_line() to simplify checking for a line break.

Problem:    Vim9: no line break allowed in () expression.
Solution:   Skip a line break.

Problem:    Vim9: no line break allowed inside a lambda.
Solution:   Handle line break inside a lambda in Vim9 script.

Problem:    Vim9: no line break allowed inside a dict.
Solution:   Handle line break inside a dict in Vim9 script.

Problem:    Expression "!expr->func()" does not work.
Solution:   Apply plus and minus earlier. (closes #6348)

Problem:    Vim9: no line break allowed inside a list.
Solution:   Handle line break inside a list in Vim9 script.

Problem:    Vim9: no line break allowed before comperators.
Solution:   Check for comperator after line break.

Problem:    Vim9: no line break allowed before || or &&.
Solution:   Check for operator after line break.

Problem:    Vim9: no line break allowed inside "cond ? val1 : val2".
Solution:   Check for operator after line break.

Problem:    Vim9: script cannot use line continuation like in a :def function.
Solution:   Pass the getline function pointer to the eval() functions.  Use it
            for addition and multiplication operators.

Problem:    Vim9: line break before operator does not work.
Solution:   Peek the next line for an operator.

Problem:    Vim9: cannot put an operator on the next line.
Solution:   Require a colon before a range to see if that causes problems.

Problem:    Vim9: cannot chain function calls with -> at line start.
Solution:   Peek ahead for a following line starting with "->". (closes #6306)

Problem:    Vim9: no error for declaring buffer, window, etc. variable.
Solution:   Give an error.  Unify the error messages.

Problem:    Vim9: cannot break the line after "->".
Solution:   Check for a continuation line after "->", "[" and ".".  Ignore
            trailing white space.

Problem:    Vim9: some code not tested.
Solution:   Add a few more test cases.  Reorder checks for clearer error.
            Remove unreachable code.

Problem:    Vim9: expression testing lost coverage using constants.
Solution:   Use a few variables instead of constants.

Problem:    Vim9: instructions not tested
Solution:   Use a variable instead of a constant.

Problem:    Vim9: dict member errors not tested.
Solution:   Delete unreachable error.  Add tests.

Problem:    Vim9: Assignment to dict member does not work.
Solution:   Parse dict assignment. Implement getting dict member.

Problem:    Vim9: more expressions can be evaluated at compile time
Solution:   Recognize has('name').

Problem:    Vim9: handling constant expression does not scale.
Solution:   Use another solution, passint typval_T.

Problem:    Vim9: constant expressions are not simplified.
Solution:   Simplify string concatenation.

Problem:    Vim9: not all errors tested.
Solution:   Add test for deleted function.  Bail out on first error.

Problem:    Vim9: no test for equal func type.
Solution:   Add a test.  Improve type check.

Problem:    Vim9: no check if called variable is a FuncRef.
Solution:   Add a type check.

Problem:    Vim9: script function can be deleted.
Solution:   Disallow deleting script function.  Delete functions when sourcing
            a script again.