vim-patch:8.2.0013: not using a typedef for condstack

Problem:    Not using a typedef for condstack.
Solution:   Add a typedef.
ddef129160

src/nvim/ex_cmds_defs.h

@@ -12,31 +12,29 @@
 # include "ex_cmds_enum.generated.h"
 #endif
 
-/*
- * When adding an Ex command:
- * 1. Add an entry to the table in src/nvim/ex_cmds.lua.  Keep it sorted on the 
- *    shortest version of the command name that works.  If it doesn't start with 
- *    a lower case letter, add it at the end.
- *
- *    Each table entry is a table with the following keys:
- *
- *      Key     | Description
- *      ------- | -------------------------------------------------------------
- *      command | Name of the command. Required.
- *      enum    | Name of the enum entry. If not set defaults to CMD_{command}.
- *      flags   | A set of the flags from below list joined by bitwise or.
- *      func    | Name of the function containing the implementation.
- *
- *    Referenced function should be either non-static one or defined in 
- *    ex_docmd.c and be coercible to ex_func_T type from below.
- *
- *    All keys not described in the above table are reserved for future use.
- *
- * 2. Add a "case: CMD_xxx" in the big switch in ex_docmd.c.
- * 3. Add an entry in the index for Ex commands at ":help ex-cmd-index".
- * 4. Add documentation in ../doc/xxx.txt.  Add a tag for both the short and
- *    long name of the command.
- */
+// When adding an Ex command:
+// 1. Add an entry to the table in src/nvim/ex_cmds.lua.  Keep it sorted on the
+//    shortest version of the command name that works.  If it doesn't start with
+//    a lower case letter, add it at the end.
+//
+//    Each table entry is a table with the following keys:
+//
+//      Key     | Description
+//      ------- | -------------------------------------------------------------
+//      command | Name of the command. Required.
+//      enum    | Name of the enum entry. If not set defaults to CMD_{command}.
+//      flags   | A set of the flags from below list joined by bitwise or.
+//      func    | Name of the function containing the implementation.
+//
+//    Referenced function should be either non-static one or defined in
+//    ex_docmd.c and be coercible to ex_func_T type from below.
+//
+//    All keys not described in the above table are reserved for future use.
+//
+// 2. Add a "case: CMD_xxx" in the big switch in ex_docmd.c.
+// 3. Add an entry in the index for Ex commands at ":help ex-cmd-index".
+// 4. Add documentation in ../doc/xxx.txt.  Add a tag for both the short and
+//    long name of the command.
 
 #define RANGE           0x001   /* allow a linespecs */
 #define BANG            0x002   /* allow a ! after the command name */
@@ -98,6 +96,47 @@ typedef struct cmdname {
   int cmd_addr_type;     ///< Flag for address type
 } CommandDefinition;
 
+// A list used for saving values of "emsg_silent".  Used by ex_try() to save the
+// value of "emsg_silent" if it was non-zero.  When this is done, the CSF_SILENT
+// flag below is set.
+typedef struct eslist_elem eslist_T;
+struct eslist_elem {
+  int saved_emsg_silent;  // saved value of "emsg_silent"
+  eslist_T *next;         // next element on the list
+};
+
+// For conditional commands a stack is kept of nested conditionals.
+// When cs_idx < 0, there is no conditional command.
+enum {
+  CSTACK_LEN = 50,
+};
+
+typedef struct {
+  int cs_flags[CSTACK_LEN];         // CSF_ flags
+  char cs_pending[CSTACK_LEN];      // CSTP_: what's pending in ":finally"
+  union {
+    void *csp_rv[CSTACK_LEN];       // return typeval for pending return
+    void *csp_ex[CSTACK_LEN];       // exception for pending throw
+  } cs_pend;
+  void *cs_forinfo[CSTACK_LEN];     // info used by ":for"
+  int cs_line[CSTACK_LEN];          // line nr of ":while"/":for" line
+  int cs_idx;                       // current entry, or -1 if none
+  int cs_looplevel;                 // nr of nested ":while"s and ":for"s
+  int cs_trylevel;                  // nr of nested ":try"s
+  eslist_T *cs_emsg_silent_list;    // saved values of "emsg_silent"
+  int cs_lflags;                    // loop flags: CSL_ flags
+} cstack_T;
+# define cs_rettv       cs_pend.csp_rv
+# define cs_exception   cs_pend.csp_ex
+
+// Flags for the cs_lflags item in cstack_T.
+enum {
+  CSL_HAD_LOOP =    1,  // just found ":while" or ":for"
+  CSL_HAD_ENDLOOP = 2,  // just found ":endwhile" or ":endfor"
+  CSL_HAD_CONT =    4,  // just found ":continue"
+  CSL_HAD_FINA =    8,  // just found ":finally"
+};
+
 /// Arguments used for Ex commands.
 struct exarg {
   char_u      *arg;             ///< argument of the command
@@ -128,7 +167,7 @@ struct exarg {
   char_u *errmsg;               ///< returned error message
   LineGetter getline;           ///< Function used to get the next line
   void   *cookie;               ///< argument for getline()
-  struct condstack *cstack;     ///< condition stack for ":if" etc.
+  cstack_T *cstack;             ///< condition stack for ":if" etc.
 };
 
 #define FORCE_BIN 1             // ":edit ++bin file"