Golang go/ast.IndexExpr type example

package go/ast

An IndexExpr node represents an expression followed by an index.

Golang go/ast.IndexExpr type usage example

 func NodeDescription(n ast.Node) string {
 switch n := n.(type) {
 case *ast.ArrayType:
 return "array type"
 case *ast.AssignStmt:
 return "assignment"
 case *ast.IndexExpr:
 return "index expression"
  }

Reference :

http://golang.org/pkg/go/ast/#IndexExpr