patch 8.1.1588: in :let-heredoc line continuation is recognized commit https://github.com/vim/vim/commit/e96a2498f9a2d3e93ac07431f6d4afd77f30afdf Author: Bram Moolenaar <Bram@vim.org> Date: Tue Jun 25 04:12:16 2019 +0200 patch 8.1.1588: in :let-heredoc line continuation is recognized Problem: In :let-heredoc line continuation is recognized. Solution: Do not consume line continuation. (Ozaki Kiichi, closes https://github.com/vim/vim/issues/4580)

--- a/src/eval.c
+++ b/src/eval.c
@@ -1307,7 +1307,7 @@ heredoc_get(exarg_T *eap, char_u *cmd)
 	int	mi = 0;
 	int	ti = 0;
 
-	theline = eap->getline(NUL, eap->cookie, 0);
+	theline = eap->getline(NUL, eap->cookie, 0, FALSE);
 	if (theline == NULL)
 	{
 	    semsg(_("E990: Missing end marker '%s'"), marker);