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x/tools/cmd/guru: nil dereference error #14579

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maddyblue opened this issue Mar 1, 2016 · 1 comment
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x/tools/cmd/guru: nil dereference error #14579

maddyblue opened this issue Mar 1, 2016 · 1 comment
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@maddyblue
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On go 1.6 linux amd64, guru at revision 8b178a9, the following code as main.go:

package main

func main() {
    F()
}

invoked by (#30 is the position after the F):

guru describe main.go:#30

panics with:

main.go:#30, exit status 2: panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x28 pc=0x5fe56f]

goroutine 1 [running]:
panic(0x81c380, 0xc82000e120)
    /usr/local/go/src/runtime/panic.go:464 +0x3e6
golang.org/x/tools/go/types/typeutil.IntuitiveMethodSet(0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
    /go/src/golang.org/x/tools/go/types/typeutil/ui.go:25 +0x9f
main.accessibleMethods(0x0, 0x0, 0xc820089770, 0x0, 0x0, 0x0)
    /go/src/golang.org/x/tools/cmd/guru/describe.go:797 +0x74
main.describeValue(0xc820076bc0, 0xc820086780, 0x5, 0x8, 0xc820086780, 0x0, 0x0)
    /go/src/golang.org/x/tools/cmd/guru/describe.go:335 +0x2c8
main.describe(0xc8200cca80, 0x0, 0x0)
    /go/src/golang.org/x/tools/cmd/guru/describe.go:58 +0x3e5
main.Run(0xc8200cca80, 0x0, 0x0)
    /go/src/golang.org/x/tools/cmd/guru/guru.go:118 +0x416
main.main()
    /go/src/golang.org/x/tools/cmd/guru/main.go:204 +0x8d5
@ianlancetaylor ianlancetaylor changed the title x/tools/cmd/guru x/tools/cmd/guru: nil dereference error Mar 1, 2016
@ianlancetaylor ianlancetaylor added this to the Unreleased milestone Mar 1, 2016
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CL https://golang.org/cl/20100 mentions this issue.

gopherbot pushed a commit to golang/tools that referenced this issue Mar 1, 2016
@adonovan
cmd/guru: fix nil dereference in describe
6f233b9 
+ test

Fixes issue golang/go#14579

Change-Id: I6fd56f10c170027f06917935ccbc28490d413d8a
Reviewed-on: https://go-review.googlesource.com/20100
Reviewed-by: Michael Matloob <matloob@golang.org>
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