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]*
>
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> *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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