Public bug reported:

This file is enough to cause it: http://pastebin.ubuntu.com/14858123/
And this is the result:

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x28 pc=0x40b5a3]

goroutine 1 [running]:
main.cgoBaseType(0xc8200cc000, 0x7f5b327dec58, 0xc8200c63e0, 0x0, 0x0)
        /usr/lib/go/src/cmd/vet/cgo.go:75 +0x2d3
main.checkCgoCall(0xc8200cc000, 0x7f5b327de930, 0xc820013300)
        /usr/lib/go/src/cmd/vet/cgo.go:42 +0x1ad
main.(*File).Visit(0xc8200cc000, 0x7f5b327de930, 0xc820013300, 0x0, 0x0)
        /usr/lib/go/src/cmd/vet/main.go:485 +0x1ba
go/ast.Walk(0x7f5b327defd0, 0xc8200cc000, 0x7f5b327de930, 0xc820013300)
        /usr/lib/go/src/go/ast/walk.go:52 +0x56
go/ast.walkExprList(0x7f5b327defd0, 0xc8200cc000, 0xc8200c4380, 0x1, 0x1)
        /usr/lib/go/src/go/ast/walk.go:26 +0xd5
go/ast.Walk(0x7f5b327defd0, 0xc8200cc000, 0x7f5b327df028, 0xc8200c3a90)
        /usr/lib/go/src/go/ast/walk.go:308 +0xf63
go/ast.Walk(0x7f5b327defd0, 0xc8200cc000, 0x7f5b327dea50, 0xc820013340)
        /usr/lib/go/src/go/ast/walk.go:331 +0x1f7d
go/ast.walkDeclList(0x7f5b327defd0, 0xc8200cc000, 0xc8200c43b0, 0x1, 0x1)
        /usr/lib/go/src/go/ast/walk.go:38 +0xd5
go/ast.Walk(0x7f5b327defd0, 0xc8200cc000, 0x7f5b327ded70, 0xc820018600)
        /usr/lib/go/src/go/ast/walk.go:353 +0x29b9
main.(*File).walkFile(0xc8200cc000, 0x7ffc85f63ec0, 0x9, 0xc820018600)
        /usr/lib/go/src/cmd/vet/main.go:454 +0x1f5
main.doPackage(0x7a0178, 0x1, 0xc82000a490, 0x1, 0x1, 0x0)
        /usr/lib/go/src/cmd/vet/main.go:353 +0xd97
main.main()
        /usr/lib/go/src/cmd/vet/main.go:243 +0x420
exit status 2


adding parentheses to that, i.e. C.f((*p(**q))), is enough to make go vet happy 
again.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: golang-go 2:1.6~beta2-0ubuntu1
ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
Uname: Linux 4.3.0-5-generic x86_64
ApportVersion: 2.19.4-0ubuntu1
Architecture: amd64
Date: Tue Feb  2 16:38:20 2016
InstallationDate: Installed on 2014-04-27 (645 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
SourcePackage: golang
SystemImageInfo: Error: command ['system-image-cli', '-i'] failed with exit 
code 2:
UpgradeStatus: Upgraded to xenial on 2015-06-18 (228 days ago)

** Affects: golang (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1541014

Title:
  'go vet' falls over on expressions like C.f(*p(**q))

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