Just one documentation glitch.
https://codereview.appspot.com/6920051/diff/5001/src/cmd/gc/go.y
File src/cmd/gc/go.y (right):
https://codereview.appspot.com/6920051/diff/5001/src/cmd/gc/go.y#newcode983
src/cmd/gc/go.y:983: // introduce an anchor node to give the correct
line.
s/introduce/Introduce/
https://codereview.appspot.com/6920051/