segment violation running compiler

[robaho]

Using Go 1.11 - just made some code changes, and now when the compiler runs, it fails with:

github.com/robaho/keydb

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x70 pc=0x177bcbe]

goroutine 1 [running]:
cmd/compile/internal/gc.typecheck1(0xc0002e7400, 0x2, 0xc000660aa8)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:1270 +0x3ece
cmd/compile/internal/gc.typecheck(0xc0002e7400, 0x2, 0x0)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:238 +0x6ad
cmd/compile/internal/gc.typecheckslice(0xc0003c7a00, 0x2, 0x2, 0x2)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:68 +0x50
cmd/compile/internal/gc.typecheck1(0xc0002e7380, 0x2, 0x0)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:1236 +0x3b10
cmd/compile/internal/gc.typecheck(0xc0002e7380, 0x2, 0xc000091800)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:238 +0x6ad
cmd/compile/internal/gc.typecheckas(0xc0002e7300)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:3336 +0xa4
cmd/compile/internal/gc.typecheck1(0xc0002e7300, 0x1, 0xc000090900)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:1985 +0x332a
cmd/compile/internal/gc.typecheck(0xc0002e7300, 0x1, 0xc00045a000)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:238 +0x6ad
cmd/compile/internal/gc.typecheckslice(0xc000495fc0, 0x4, 0x4, 0x1)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:68 +0x50
cmd/compile/internal/gc.typecheck1(0xc0002e7100, 0x1, 0xc0002e6e80)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:2059 +0xabaf
cmd/compile/internal/gc.typecheck(0xc0002e7100, 0x1, 0xc0002e6e80)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:238 +0x6ad
cmd/compile/internal/gc.typecheckslice(0xc0002ecd00, 0xa, 0x10, 0x1)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/typecheck.go:68 +0x50
cmd/compile/internal/gc.Main(0x18c0388)
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/internal/gc/main.go:518 +0x2059
main.main()
/usr/local/Cellar/go/1.11/libexec/src/cmd/compile/main.go:51 +0x96

Compilation finished with exit code 2

[randall77]

Might be a dup of #27356.

[robaho]

attached patch file containing the code changes that cause the error

compile_error.patch.txt

[robaho]

I believe you are correct, as intellij is showing the line to be in error, but it looks ok to me... not sure what the problem is... ds.keyIndex is a slice

[robaho]

I see the problem, the method parameter is called 'len' and it is hiding the built-in len... so yes, I am going to close this as a duplicate