November 9, 2016 16:17 · Nov 9, 2016
diff --git a/test_a_sayer.go b/test_a_sayer.go
@@ -0,0 +1,13 @@
+package a
+
+import "fmt"
+
+type Sayer interface {
+    Say() string
+}
+
+type Formal struct{}
+
+func (p Formal) Greet(s interface{Sayer}) string {
+    return fmt.Sprintf("Hello, %s", s.Say())
+}
diff --git a/test_b_sayer.go b/test_b_sayer.go
@@ -0,0 +1,13 @@
+package b
+
+import "fmt"
+
+type Sayer interface {
+    Say() string
+}
+
+type Casual struct{}
+
+func (p Casual) Greet(s interface{Sayer}) string {
+    return fmt.Sprintf("Hey %s!", s.Say())
+}
diff --git a/test_greet_greet.go b/test_greet_greet.go
@@ -0,0 +1,13 @@
+package greet
+
+type Sayer interface {
+    Say() string
+}
+
+type Greeter interface {
+    Greet(s interface{Sayer}) string
+}
+
+func Greet(g interface{Greeter}, i Sayer) string {
+    return g.Greet(i)
+}
diff --git a/test_main.go b/test_main.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+    "log"
+    "test/a"
+    "test/b"
+    "test/greet"
+)
+
+type Who struct {
+    to string
+}
+
+func (w Who) Say() string {
+    return w.to
+}
+
+func main() {
+    log.Println("Testing...")
+
+    a := a.Formal{}
+    b := b.Casual{}
+
+
+    w := &Who{
+        to:"world",
+    }
+
+    log.Println(greet.Greet(a, w))
+    log.Println(greet.Greet(b, w))
+}
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