Parser rejects streaming operators that use the "with" clause

[fpgauserdude]

Describe the bug

Rejects valid syntax.

To Reproduce

byte result[$];
result = {>>{bytes with [start_indx: end_indx]}};

Include any options used.

Actual behavior:

Syntax error "with"

Expected behavior

See LRM 1800-2017 section 11.4.14 Streaming operators (pack/unpack). This is valid syntax that commercial tools have no problem with.