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

https://github.com/vim/vim/commit/ea746f9e862092aef3d4e95c64d116759b9fabe0

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

2 files changed, 9 insertions, 1 deletions

diff --git a/src/nvim/eval.lua b/src/nvim/eval.lua
index 28fb9c6a5c..951dd2adbb 100644
--- a/src/nvim/eval.lua
+++ b/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' } },
diff --git a/src/nvim/strings.c b/src/nvim/strings.c
index 0d307a760f..7ba11ed8e5 100644
--- a/src/nvim/strings.c
+++ b/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");