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rc: revert 2f8a59f4b5bfe028c022855acc19666d69eed909

this patch doesn't pull its weight; it's not worth it.

--- a/sys/src/cmd/rc/syn.y

+++ b/sys/src/cmd/rc/syn.y

@@ -17,7 +17,7 @@

 	struct tree *tree;

 };

 %type<tree> line paren brace body cmdsa cmdsan assign epilog redir

-%type<tree> cmd simple first word comword keyword words comwords

+%type<tree> cmd simple first word comword keyword words

 %type<tree> NOT FOR IN WHILE IF TWIDDLE BANG SUBSHELL SWITCH FN

 %type<tree> WORD REDIR DUP PIPE

 %%

@@ -68,10 +68,8 @@

 |	assign cmd %prec BANG	{$$=mung3($1, $1->child[0], $1->child[1], $2);}

 |	BANG cmd		{$$=mung1($1, $2);}

 |	SUBSHELL cmd		{$$=mung1($1, $2);}

-|	FN comwords brace	{$$=tree2(FN, $2, $3);}

-|	FN comwords SUBSHELL brace

-				{$$=tree2(FN, $2, mung1($3, $4));}

-|	FN comwords		{$$=tree1(FN, $2);}

+|	FN words brace		{$$=tree2(FN, $2, $3);}

+|	FN words		{$$=tree1(FN, $2);}

 simple:	first

 |	simple word		{$$=tree2(ARGLIST, $1, $2);}

 |	simple redir		{$$=tree2(ARGLIST, $1, $2);}

@@ -92,5 +90,3 @@

 keyword: FOR|IN|WHILE|IF|NOT|TWIDDLE|BANG|SUBSHELL|SWITCH|FN

 words:				{$$=(struct tree*)0;}

 |	words word		{$$=tree2(WORDS, $1, $2);}

-comwords:			{$$=(struct tree*)0;}

-|	comwords comword	{$$=tree2(WORDS, $1, $2);}