[BUG+PATCH] `zsh -n` shouldn't check for alias func def

[Marlon Richert <marlon.richert@gmail.com>]

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Using `zsh -n` to syntax check gives a false positive for this case,
which is valid syntax:

% zsh -nc 'unalias which-command; which-command() {}'
zsh:1: defining function based on alias `which-command'
zsh:1: parse error near `()'

This patch fixes that.

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From 963ec42be4d6d980baa468307ee945bc515f0ca3 Mon Sep 17 00:00:00 2001
From: Marlon Richert <marlonrichert@users.noreply.github.com>
Date: Mon, 6 Sep 2021 19:24:23 +0300
Subject: [PATCH] Don't check for alias func defs when in NO_EXEC mode

---
 Src/parse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Src/parse.c b/Src/parse.c
index be26112a5..10d193ba1 100644
--- a/Src/parse.c
+++ b/Src/parse.c
@@ -2052,7 +2052,7 @@ par_simple(int *cmplx, int nr)
 	    /* Error if preceding assignments */
 	    if (assignments || postassigns)
 		YYERROR(oecused);
-	    if (hasalias && !isset(ALIASFUNCDEF) && argc &&
+	    if (isset(EXECOPT) && hasalias && !isset(ALIASFUNCDEF) && argc &&
 		hasalias != input_hasalias()) {
 		zwarn("defining function based on alias `%s'", hasalias);
 		YYERROR(oecused);
-- 
2.30.1 (Apple Git-130)