__FILE__ undefined

[mitch000001]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.8.3 darwin/amd64

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN="/Users/401208/bin"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/401208"
GORACE=""
GOROOT="/usr/local/opt/go/libexec"
GOTOOLDIR="/usr/local/opt/go/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/9q/wtg2gqwd57x88fy6qw79klsn6zl9w9/T/go-build854393630=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"

What version of GoRuby are you using (git show -s --format=%H or goruby -version)?

git show -s --format=%H
# => 07b0c0a9b40cc6551c20cc830965e315ab61c803

What did you do?

cat <<EOF > /tmp/foo
> puts __FILE__
> EOF
go run main.go /tmp/foo

What did you expect to see?

/tmp/foo

What did you see instead?

undefined local variable or method `__FILE__' for main:Object
exit status 1

[skx]

This is an interesting bug, with the current repository:

  $ git show -s --format=%H
  ee5b7274d84c124a2bd3b3d6f1e2c78d31148cc5

There have obviously been changes now, such that __FILE__ is defined. The following code works:

   frodo ~/go/src/github.com/goruby/goruby $ cat > t.rb <<EOF
   > puts( __FILE__ )
   > EOF
   frodo ~/go/src/github.com/goruby/goruby $ ./goruby t.rb 
   t.rb

However this code fails:

     puts __FILE__

(Outputs an empty line.)

I've updated kernel.go:

   func kernelPuts(context CallContext, args ...RubyObject) (RubyObject, error) {
   	out := ""
   	fmt.Printf("Argument count %d\n", len(args))
   	for i, arg := range args {
   		fmt.Printf("Arg %i: %v\n", i, arg)
   		out += arg.Inspect()
   	}
   
   	fmt.Println(out)
   	return NIL, nil
   }

Now the sample program that works outputs things you'd expect:

  $ cat  tt.rb
  puts( __FILE__ )
  $ go build . && ./goruby tt.rb 
  Argument count 1
  Arg %!i(int=0): &{tt.rb}
  tt.rb

But the version without the parenthesis receives nothing:

 $ cat t.rb
 puts __FILE__
 $ go build . && ./goruby t.rb 
 Argument count 0

So something odd is going on there :)