}
        if (offset == nextStart) {
          /*
           * This occurs when some pattern has an empty match, even if it doesn't match the empty
           * string -- for example, if it requires lookahead or the like. The offset must be
           * increased to look for separators beyond this point, without changing the start position
           * of the next returned substring -- so nextStart stays the same.
           */

ask,a.prev[f&a.w_mask]=a.head[a.ins_h],a.head[a.ins_h]=f,f++,a.insert--,!(a.lookahead+a.insert<hb)););}while(a.lookahead<jb&&0!==a.strm.avail_in)}function n(a,b){var c=65535;for(c>a.pending_buf_size-5&&(c=a.pending_buf_size-5);;){if(a.lookahead<=1){if(m(a),0===a.lookahead&&b===H)return sb;if(0===a.lookahead)break}a.strstart+=a.lookahead,a.lookahead=0;var d=a.block_start+c;if((0===a.strstart||a.strstart>=d)&&(a.lookahead=a.strstart-d,a.strstart=d,h(a,!1),0===a.strm.avail_out))return sb;if(a.strst...

				w.n = m
				err = nil
			} else if nDst > 0 || nSrc > 0 {
				// Not enough buffer to store the remainder. Keep processing as
				// long as there is progress. Without this case, transforms that
				// require a lookahead larger than the buffer may result in an
				// error. This is not something one may expect to be common in
				// practice, but it may occur when buffers are set to small
				// sizes during testing.
				continue
			}

		p := &Parser{l: &Lexer{s: v.s, pos: 0}, position: 0}
		p.scan()
		if len(p.scannedItems) != len(v.t) {
			t.Errorf("Expected %d items found %d", len(v.t), len(p.scannedItems))
		}
		for {
			token, lit := p.lookahead(KeyAndOperator)

			token2, lit2 := p.consume(KeyAndOperator)
			if token == EndOfStringToken {
				break
			}
			if token != token2 || lit != lit2 {
				t.Errorf("Bad values")
			}
		}
	}

				w.n = m
				err = nil
			} else if nDst > 0 || nSrc > 0 {
				// Not enough buffer to store the remainder. Keep processing as
				// long as there is progress. Without this case, transforms that
				// require a lookahead larger than the buffer may result in an
				// error. This is not something one may expect to be common in
				// practice, but it may occur when buffers are set to small
				// sizes during testing.
				continue
			}

			if name == s {
				return i
			}
		}
	}
	return -1
}

const endOfText rune = -1

// input abstracts different representations of the input text. It provides
// one-character lookahead.
type input interface {
	step(pos int) (r rune, width int) // advance one rune
	canCheckPrefix() bool             // can we look ahead without losing info?
	hasPrefix(re *Regexp) bool
	index(re *Regexp, pos int) int

			mask := s.newValue2(ssa.OpLoad, typs.Uintptr, cache, s.mem())
			// Jump to loop head.
			b := s.endBlock()
			b.AddEdgeTo(loopHead)

			// At loop head, get pointer to the cache entry.
			//   e := &cache.Entries[hash&mask]
			s.startBlock(loopHead)
			entries := s.newValue2(ssa.OpAddPtr, typs.UintptrPtr, cache, s.uintptrConstant(uint64(s.config.PtrSize)))