Golang go/ast.FuncType type example

package go/ast

A FuncType node represents a function type.

Golang go/ast.FuncType type usage example

 var testFunc *ast.FuncDecl
 ...
 blockStatement := &ast.BlockStmt{List: testFunc.Body.List}
 fieldList := &ast.FieldList{}
 funcType := &ast.FuncType{Params: fieldList}

Reference :

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