x/mobile: function with alias type as argument or return value cannot be exported

[libnat]

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

$ go version
go version go1.14.4 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

$ go env
GOARCH="amd64"
GOOS="darwin"

What did you do?

1. Create a demo pkg at ~/go/src/demo
2. Add ~/go/src/demo/model/model.go

   package model
   type IntSet struct {
   }
   

3. Add ~/go/src/demo/demo.go

   package demo
   import "demo/model"
   type IntSet = model.IntSet
   func NewIntSet() *IntSet {
       return new(IntSet)
   } 
   

4. Generate bindings
   gomobile bind -target=ios demo

What did you expect to see?

Generate bindings:

@class DemoIntSet;
@interface DemoIntSet ... 
...
FOUNDATION_EXPORT DemoIntSet* _Nullable DemoNewIntSet(void);

What did you see instead?

@class DemoIntSet;
@interface DemoIntSet ... 
...
// skipped function NewIntSet with unsupported parameter or return types

I guess gobind doesn't use demo.IntSet as demo.NewIntSet's return value type, still use model.IntSet which is not exported.
To fix this issue, I have to define a new type like type IntSet model.IntSet, in this way, it requires to rewrite all methods because now demo.IntSet is a new type. This brings lots of work.

[cagedmantis]

/cc @hyangah

[paulaolmedo]

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

$ go version
go version go1.14.4 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

What did you do?

1. Create a demo pkg at ~/go/src/demo
2. Add ~/go/src/demo/model/model.go

   package model
   type IntSet struct {
   }
   

3. Add ~/go/src/demo/demo.go

   package demo
   import "demo/model"
   type IntSet = model.IntSet
   func NewIntSet() *IntSet {
       return new(IntSet)
   } 
   

4. Generate bindings
   gomobile bind -target=ios demo

What did you expect to see?

Generate bindings:

@class DemoIntSet;
@interface DemoIntSet ... 
...
FOUNDATION_EXPORT DemoIntSet* _Nullable DemoNewIntSet(void);

What did you see instead?

@class DemoIntSet;
@interface DemoIntSet ... 
...
// skipped function NewIntSet with unsupported parameter or return types

I guess gobind doesn't use demo.IntSet as demo.NewIntSet's return value type, still use model.IntSet which is not exported.
To fix this issue, I have to define a new type like type IntSet model.IntSet, in this way, it requires to rewrite all methods because now demo.IntSet is a new type. This brings lots of work.

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

$ go version
go version go1.14.4 darwin/amd64

Does this issue reproduce with the latest release?

Yes

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

go env Output

What did you do?

1. Create a demo pkg at ~/go/src/demo
2. Add ~/go/src/demo/model/model.go

   package model
   type IntSet struct {
   }
   

3. Add ~/go/src/demo/demo.go

   package demo
   import "demo/model"
   type IntSet = model.IntSet
   func NewIntSet() *IntSet {
       return new(IntSet)
   } 
   

4. Generate bindings
   gomobile bind -target=ios demo

What did you expect to see?

Generate bindings:

@class DemoIntSet;
@interface DemoIntSet ... 
...
FOUNDATION_EXPORT DemoIntSet* _Nullable DemoNewIntSet(void);

What did you see instead?

@class DemoIntSet;
@interface DemoIntSet ... 
...
// skipped function NewIntSet with unsupported parameter or return types

I guess gobind doesn't use demo.IntSet as demo.NewIntSet's return value type, still use model.IntSet which is not exported.
To fix this issue, I have to define a new type like type IntSet model.IntSet, in this way, it requires to rewrite all methods because now demo.IntSet is a new type. This brings lots of work.

any news from this issue? the same happens to me with go1.16.1 - darwin/amd64 aaand with go1.16.2 - linux/amd64

[zwz-coding]

I have the same issue for android platform.