vim-patch:9.0.1990: strange error number

Problem:  strange error number
Solution: change error number,
          add doc tag for E1507

closes: vim/vim#13270

ea746f9e86

Co-authored-by: Christ van Willegen <cvwillegen@gmail.com>

runtime/doc/builtin.txt

@@ -5307,6 +5307,13 @@ printf({fmt}, {expr1} ...)                                            *printf()*
 <			E1505: Invalid format specifier:
 			%1$d at width %2$d is: %01$*2$.3$d
 
+							*E1507*
+		This internal error indicates that the logic to
+		parse a positional format error ran into a problem
+		that couldn't be otherwise reported. Please file a
+		bug against vim if you run into this, copying the
+		exact format string and parameters that were used.
+
 prompt_getprompt({buf})                                     *prompt_getprompt()*
 		Returns the effective prompt text for buffer {buf}.  {buf} can
 		be a buffer name or number.  See |prompt-buffer|.

runtime/lua/vim/_meta/vimfn.lua

@@ -6290,6 +6290,13 @@ function vim.fn.prevnonblank(lnum) end
 --- <  E1505: Invalid format specifier:
 ---   %1$d at width %2$d is: %01$*2$.3$d
 ---
+---           *E1507*
+--- This internal error indicates that the logic to
+--- parse a positional format error ran into a problem
+--- that couldn't be otherwise reported. Please file a
+--- bug against vim if you run into this, copying the
+--- exact format string and parameters that were used.
+---
 --- @param fmt any
 --- @param expr1? any
 --- @return any

src/nvim/eval.lua

@@ -7572,6 +7572,14 @@ M.funcs = {
       	echo printf("%1$d at width %2$d is: %01$*2$.3$d", 1, 2)
       <	E1505: Invalid format specifier:
       	%1$d at width %2$d is: %01$*2$.3$d
+
+      					*E1507*
+      This internal error indicates that the logic to
+      parse a positional format error ran into a problem
+      that couldn't be otherwise reported. Please file a
+      bug against vim if you run into this, copying the
+      exact format string and parameters that were used.
+
     ]=],
     name = 'printf',
     params = { { 'fmt', 'any' }, { 'expr1', 'any' } },

src/nvim/strings.c

@@ -46,7 +46,7 @@ static const char e_positional_arg_num_type_inconsistent_str_str[]
 static const char e_invalid_format_specifier_str[]
   = N_("E1505: Invalid format specifier: %s");
 static const char e_aptypes_is_null_nr_str[]
-  = "E1520: Internal error: ap_types or ap_types[idx] is NULL: %d: %s";
+  = "E1507: Internal error: ap_types or ap_types[idx] is NULL: %d: %s";
 
 static const char typename_unknown[] = N_("unknown");
 static const char typename_int[] = N_("int");