vim-patch:8.2.{0695,0725,0734,0753,0818,0819,0822} (#23075)

vim-patch:8.2.0695: Vim9: cannot define a function inside a function

Problem:    Vim9: cannot define a function inside a function.
Solution:   Initial support for :def inside :def.

04b1269783

vim-patch:8.2.0725: Vim9: cannot call a function declared later in Vim9 script

Problem:    Vim9: cannot call a function declared later in Vim9 script.
Solution:   Make two passes through the script file.

09689a0284

vim-patch:8.2.0734: Vim9: leaking memory when using :finish

Problem:    Vim9: leaking memory when using :finish.
Solution:   Do not check for next line in third pass.

04816717df

vim-patch:8.2.0753: Vim9: expressions are evaluated in the discovery phase

Problem:    Vim9: expressions are evaluated in the discovery phase.
Solution:   Bail out if an expression is not a constant.  Require a type for
            declared constants.

32e351179e

vim-patch:8.2.0818: Vim9: using a discovery phase doesn't work well

Problem:    Vim9: using a discovery phase doesn't work well.
Solution:   Remove the discovery phase, instead compile a function only when
            it is used.  Add :defcompile to compile def functions earlier.

822ba24743

vim-patch:8.2.0819: compiler warning for unused variable

Problem:    Compiler warning for unused variable.
Solution:   Remove the variable.

f40e51a880

vim-patch:8.2.0822: Vim9: code left over from discovery phase

Problem:    Vim9: code left over from discovery phase.
Solution:   Remove the dead code.

2eec37926d

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/eval.h

@@ -266,6 +266,11 @@ typedef int (*ex_unletlock_callback)(lval_T *, char *, exarg_T *, int);
 // Used for checking if local variables or arguments used in a lambda.
 extern bool *eval_lavars_used;
 
+/// Flag for expression evaluation.
+enum {
+  EVAL_EVALUATE = 1,  ///< when missing don't actually evaluate
+};
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "eval.h.generated.h"
 #endif