Sorry, should have mentioned I came across this in *go1.11* but I have not
validated that it is not an issue in earlier releases.
On Wednesday, August 29, 2018 at 9:14:03 PM UTC-4, Chris Taylor wrote:
>
> Hi,
>
> Before reporting this bug I thought I would post here to confirm that it
> has not been covered already.
>
> If a function argument hides a built-in function and there is an attempt
> to call the built-in function the compiler will crash with no indication of
> where it was in the compilation process, which makes it hard to find in a
> large codebase.
>
> Here is a simple repo of the issue
>
> package main
>
> var a = []byte{1,2,3}
>
> func bug(len int) bool {
> return len < len(a)
> }
>
> func main() {
> println(bug(5))
> }
>
> Here the argument len hides the built-in function len, and in that same
> function a call is made to the function len. The expected result would be a
> compiler error
>
> *cannot call non-function len (type int)*
>
> The actual result is
>
>
>> *panic: runtime error: invalid memory address or nil pointer
>> dereference[signal 0xc0000005 code=0x0 addr=0x70 pc=0xb94675]*
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *goroutine 1 [running]:cmd/compile/internal/gc.typecheck1(0xc000352580,
>> 0x2, 0xc00033fa40)
>> c:/go/src/cmd/compile/internal/gc/typecheck.go:1270
>> +0x3ed5cmd/compile/internal/gc.typecheck(0xc000352580, 0x2,
>> 0xc00033fa40) c:/go/src/cmd/compile/internal/gc/typecheck.go:238
>> +0x6b4cmd/compile/internal/gc.typecheck1(0xc000352600, 0x12,
>> 0xc000084998) c:/go/src/cmd/compile/internal/gc/typecheck.go:585
>> +0x2ccecmd/compile/internal/gc.typecheck(0xc000352600, 0x12,
>> 0xc0000849d8) c:/go/src/cmd/compile/internal/gc/typecheck.go:238
>> +0x6b4cmd/compile/internal/gc.typecheckslice(0xc0000885d0, 0x1, 0x1,
>> 0x12) c:/go/src/cmd/compile/internal/gc/typecheck.go:68
>> +0x57cmd/compile/internal/gc.typecheck1(0xc000352680, 0x1, 0xcbf373)
>> c:/go/src/cmd/compile/internal/gc/typecheck.go:2065
>> +0xadd4cmd/compile/internal/gc.typecheck(0xc000352680, 0x1, 0x3)
>> c:/go/src/cmd/compile/internal/gc/typecheck.go:238
>> +0x6b4cmd/compile/internal/gc.typecheckslice(0xc0000885d8, 0x1, 0x1,
>> 0x1) c:/go/src/cmd/compile/internal/gc/typecheck.go:68
>> +0x57cmd/compile/internal/gc.Main(0xcdea30)
>> c:/go/src/cmd/compile/internal/gc/main.go:518 +0x20d0main.main()
>> c:/go/src/cmd/compile/main.go:51 +0x9d*
>>
>
> Best Regards,
>
> Chris
>
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