brace_group      : Lbrace compound_list Rbrace

subshell         : '(' compound_list ')'

{ echo hello world; }

( echo hello world )

/* These are reserved words, not operator tokens, and are
   recognized when reserved words are recognized. */


%token  Lbrace    Rbrace    Bang
/*      '{'       '}'       '!'   */

foriin*; do

{somecommand;} >file

if !somecommand; then