Please answer these questions before submitting your issue. Thanks!

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

   1.6.3
   

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

   darwin/amd64
   

3. What did you do?

   $GOPATH/src/github.com/petejkim/foo/foo.go

   package foo
   
   func DoSomethingWithLocation(lat, long, alt float64) float64 {
     return 0.0
   }
   

   $ gomobile bind -target=ios github.com/petejkim/foo
   gomobile: darwin-armv7: go build -p=8 -pkgdir=/Users/jihoon/code/go/pkg/gomobile/pkg_darwin_arm -tags="" -buildmode=c-archive -tags=ios -o /var/folders/7t/zvcfl61j57d722hzvyxm5cym0000gn/T/gomobile-work-326555581/foo-arm.a /var/folders/7t/zvcfl61j57d722hzvyxm5cym0000gn/T/gomobile-work-326555581/src/iosbin/main.go failed: exit status 2
   # _/var/folders/7t/zvcfl61j57d722hzvyxm5cym0000gn/T/gomobile-work-326555581/src/gomobile_bind
   /var/folders/7t/zvcfl61j57d722hzvyxm5cym0000gn/T/gomobile-work-326555581/src/gomobile_bind/GoFoo.m:21:54: error: parameter name omitted
   /var/folders/7t/zvcfl61j57d722hzvyxm5cym0000gn/T/gomobile-work-326555581/src/gomobile_bind/GoFoo.m:23:25: error: expected expression
   

4. What did you expect to see?

   I expected it to show an error saying it cannot be compiled due to the presence of reserved keyword long. It would be better if it could just handle it automatically by perhaps prepending/appending _ to the reserved keyword (_long) to avoid Obj-C compilation error.

5. What did you see instead?

   A cryptic error message. It took me a while before I realized it was due to the argument name long (short for longitude in my case), which is a reserved keyword (a data type) in ObjC.