--- ksh_20120801/src/cmd/ksh93/sh/lex.c	2012-06-12 21:05:18.000000000 +0200

+++ ksh_20120801/src/cmd/ksh93/sh/lex.c	2015-08-18 17:42:06.138076565 +0200

@@ -1603,7 +1603,14 @@ static int comsub(register Lex_t *lp, in

 				if(n==4)

 					break;

 				if(sh_lexstates[ST_NAME][c])

+				{

+					if(c==' ' || c=='\t')

+					{

+						n = 0;

+						continue;

+					}

 					goto skip;

+				}

 				word[n++] = c;

 			}

 			if(sh_lexstates[ST_NAME][c]==S_BREAK)

--- ksh_20120801/src/cmd/ksh93/tests/subshell.sh	2012-07-25 23:40:29.000000000 +0200

+++ ksh_20120801/src/cmd/ksh93/tests/subshell.sh	2015-08-18 17:42:06.143076553 +0200

@@ -617,4 +617,6 @@ do	if	[[ -e $f ]]

 	fi

 done

+$SHELL > /dev/null -c 'echo $(for x in whatever; do case y in *) true;; esac; done)' || err_exit 'syntax error with case in command substitution'

+

 exit $((Errors<125?Errors:125))