sh: Detect an error for ${#var<GARBAGE>}.

In particular, this makes things like ${#foo[0]} and ${#foo[@]} errors
rather than silent equivalents of ${#foo}.

PR:		bin/151720
Submitted by:	Mark Johnston
Exp-run done by: pav (with some other sh(1) changes)

1 files changed, 2 insertions, 0 deletions

diff --git a/bin/sh/parser.c b/bin/sh/parser.c
index c4191b4..43822f9 100644
--- a/bin/sh/parser.c
+++ b/bin/sh/parser.c
@@ -1569,6 +1569,8 @@ varname:
 				}
 			}
 		} else if (subtype != VSERROR) {
+			if (subtype == VSLENGTH && c != '}')
+				subtype = VSERROR;
 			pungetc();
 		}
 		STPUTC('=', out);