Initial commit

first/explain/packages/scopes/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello!")
+
+	// two files belong to the same package
+	// calling `bye()` of bye.go here
+	bye()
+}
+
+// EXERCISE: Remove the comments from the below function
+//           And analyze the error message
+
+// func bye() {
+// 	fmt.Println("Bye!")
+// }
+
+// ***** EXPLANATION *****
+//
+// ERROR: "bye" function "redeclared"
+//        in "this block"
+//
+// "this block" means = "main package"
+//
+// "redeclared" means = you're using the same name
+//   in the same scope again
+//
+// main package's scope is:
+// all source-code files which are in the same main package