spec: function invocation, panic on *nil Document that indirection through a nil pointer will panic. Explain function invocation. This section will need more work, but it's a start.
spec: function invocation, panic on *nil
Document that indirection through a nil pointer will panic.
Explain function invocation.
This section will need more work, but it's a start.

Fixes issue 1865.
Fixes issue 2252.

R=rsc, iant, r
CC=golang-dev
http://codereview.appspot.com/5532114

gnanderson/go,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,gnanderson/go,apparentlymart/golang,dsriram/golang,apparentlymart/golang,gnanderson/go,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,dsriram/golang,tv42/old-go,apparentlymart/golang,pombredanne/go-deleteme,tv42/old-go,pombredanne/go-deleteme,gnanderson/go,gnanderson/go,dsriram/golang,dsriram/golang,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go,dsriram/golang,gnanderson/go,apparentlymart/golang,dsriram/golang,pombredanne/go-deleteme,tv42/old-go