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rc: add subshell-function syntax

fn foo @{bar} is now equivalent to
fn foo {@{bar}}. As a side effect,
this disallows creating functions
named after keywords without first
quoting them.

--- 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

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

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

 %type<tree> WORD REDIR DUP PIPE

 %%

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

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

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

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

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

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

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

+|	FN comwords SUBSHELL brace

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

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

 simple:	first

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

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

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

 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);}