Merge #8589 'VimL: Remove legacy v:xx aliases'

runtime/doc/eval.txt

@@ -1508,8 +1508,7 @@ v:errmsg	Last given error message.  It's allowed to set this variable.
 	:silent! next
 	:if v:errmsg != ""
 	:  ... handle error
-<		"errmsg" also works, for backwards compatibility.
-
+<
 					*v:errors* *errors-variable*
 v:errors	Errors found by assert functions, such as |assert_true()|.
 		This is a list of strings.
@@ -1813,8 +1812,7 @@ v:shell_error	Result of the last shell command.  When non-zero, the last
 	:if v:shell_error
 	:  echo 'could not rename "foo" to "bar"!'
 	:endif
-<		"shell_error" also works, for backwards compatibility.
-
+<
 					*v:statusmsg* *statusmsg-variable*
 v:statusmsg	Last given status message.  It's allowed to set this variable.
 
@@ -1888,7 +1886,6 @@ v:testing	Must be set before using `test_garbagecollect_now()`.
 v:this_session	Full filename of the last loaded or saved session file.  See
 		|:mksession|.  It is allowed to set this variable.  When no
 		session file has been saved, this variable is empty.
-		"this_session" also works, for backwards compatibility.
 
 					*v:throwpoint* *throwpoint-variable*
 v:throwpoint	The point where the exception most recently caught and not

runtime/doc/starting.txt

@@ -837,7 +837,7 @@ resulting file, when executed with a ":source" command:
    such as creating menu items in the GUI version.
 
 After restoring the Session, the full filename of your current Session is
-available in the internal variable "v:this_session" |this_session-variable|.
+available in the internal variable |v:this_session|.
 An example mapping: >
   :nmap <F2> :wa<Bar>exe "mksession! " . v:this_session<CR>:so ~/sessions/
 This saves the current Session, and starts off the command to load another.

runtime/doc/vim_diff.txt

@@ -352,6 +352,9 @@ TUI:
 
 VimL (Vim script) compatibility:
   `count` does not alias to |v:count|
+  `errmsg` does not alias to |v:errmsg|
+  `shell_error` does not alias to |v:shell_error|
+  `this_session` does not alias to |v:this_session|
 
 ==============================================================================
 5. Missing legacy features				 *nvim-features-missing*

src/nvim/eval.c

@@ -344,11 +344,11 @@ static struct vimvar {
   VV(VV_COUNT,          "count",            VAR_NUMBER, VV_RO),
   VV(VV_COUNT1,         "count1",           VAR_NUMBER, VV_RO),
   VV(VV_PREVCOUNT,      "prevcount",        VAR_NUMBER, VV_RO),
-  VV(VV_ERRMSG,         "errmsg",           VAR_STRING, VV_COMPAT),
+  VV(VV_ERRMSG,         "errmsg",           VAR_STRING, 0),
   VV(VV_WARNINGMSG,     "warningmsg",       VAR_STRING, 0),
   VV(VV_STATUSMSG,      "statusmsg",        VAR_STRING, 0),
-  VV(VV_SHELL_ERROR,    "shell_error",      VAR_NUMBER, VV_COMPAT+VV_RO),
-  VV(VV_THIS_SESSION,   "this_session",     VAR_STRING, VV_COMPAT),
+  VV(VV_SHELL_ERROR,    "shell_error",      VAR_NUMBER, VV_RO),
+  VV(VV_THIS_SESSION,   "this_session",     VAR_STRING, 0),
   VV(VV_VERSION,        "version",          VAR_NUMBER, VV_COMPAT+VV_RO),
   VV(VV_LNUM,           "lnum",             VAR_NUMBER, VV_RO_SBX),
   VV(VV_TERMRESPONSE,   "termresponse",     VAR_STRING, VV_RO),

src/nvim/ex_docmd.c

@@ -7920,7 +7920,7 @@ static void ex_mkrc(exarg_T *eap)
     if (failed) {
       EMSG(_(e_write));
     } else if (eap->cmdidx == CMD_mksession) {
-      // successful session write - set this_session var
+      // successful session write - set v:this_session
       char *const tbuf = xmalloc(MAXPATHL);
       if (vim_FullName(fname, tbuf, MAXPATHL, false) == OK) {
         set_vim_var_string(VV_THIS_SESSION, tbuf, -1);
@@ -8784,15 +8784,15 @@ makeopens(
   if (ssop_flags & SSOP_BUFFERS)
     only_save_windows = FALSE;                  /* Save ALL buffers */
 
-  /*
-   * Begin by setting the this_session variable, and then other
-   * sessionable variables.
-   */
-  if (put_line(fd, "let v:this_session=expand(\"<sfile>:p\")") == FAIL)
+  // Begin by setting v:this_session, and then other sessionable variables.
+  if (put_line(fd, "let v:this_session=expand(\"<sfile>:p\")") == FAIL) {
     return FAIL;
-  if (ssop_flags & SSOP_GLOBALS)
-    if (store_session_globals(fd) == FAIL)
+  }
+  if (ssop_flags & SSOP_GLOBALS) {
+    if (store_session_globals(fd) == FAIL) {
       return FAIL;
+    }
+  }
 
   /*
    * Close all windows but one.

test/functional/eval/special_vars_spec.lua

@@ -174,5 +174,17 @@ describe('Special values', function()
       command('let count = []') -- v:count is readonly
       eq(1, eval('count is# g:["count"]'))
     end)
+    it('v:errmsg is distinct from errmsg', function()
+      command('let errmsg = 1')
+      eq(1, eval('errmsg is# g:["errmsg"]'))
+    end)
+    it('v:shell_error is distinct from shell_error', function()
+      command('let shell_error = []') -- v:shell_error is readonly
+      eq(1, eval('shell_error is# g:["shell_error"]'))
+    end)
+    it('v:this_session is distinct from this_session', function()
+      command('let this_session = []')
+      eq(1, eval('this_session is# g:["this_session"]'))
+    end)
   end)
 end)