patch 8.2.0339: Vim9: function return type may depend on arguments Commit: https://github.com/vim/vim/commit/fbdd08ed9b1798885915c7f27c94786906d258e4 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 1 14:04:46 2020 +0100 patch 8.2.0339: Vim9: function return type may depend on arguments Problem: Vim9: function return type may depend on arguments. Solution: Instead of a fixed return type use a function to figure out the return type.

--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -752,6 +752,12 @@ f_getbufline(typval_T *argvars, typval_T
     get_buffer_lines(buf, lnum, end, TRUE, rettv);
 }
 
+    type_T *
+ret_f_getline(int argcount, type_T **argtypes UNUSED)
+{
+    return argcount == 1 ? &t_string : &t_list_string;
+}
+
 /*
  * "getline(lnum, [end])" function
  */