LWG3536 Should chrono::from_stream() assign zero to duration for failure?

Author: jensmaurer

source/time.tex

@@ -2156,9 +2156,8 @@
 into the duration \tcode{d}
 using the format flags given in the NTCTS \tcode{fmt}
 as specified in \ref{time.parse}.
-If the parse parses everything specified by the parsing format flags without error,
-and yet none of the flags impacts a duration,
-\tcode{d} will be assigned a zero value.
+If the parse fails to decode a valid duration,
+\tcode{is.setstate(ios_base::failbit)} is called and \tcode{d} is not modified.
 If \tcode{\%Z} is used and successfully parsed,
 that value will be assigned to \tcode{*abbrev} if \tcode{abbrev} is non-null.
 If \tcode{\%z} (or a modified variant) is used and successfully parsed,