Hi,

I was working on a tool for internal use where I had to work with the go's 
abstract syntax tree specially with the FuncDecls. I wanted to filter the 
ast to only function declarations without methods. I was wondering if there 
is a way to distinguish between normal functions and structure methods. I'm 
sure there must be a way since the godoc distinguishes them but don't know 
if they had to implement it in a certain way.

Currently my code uses AST's inspect function and traverses the tree. 
Example, 

```Go
ast.Inspect(syntaxtTree,  func(n *ast.Node) bool {
    ...
    switch x := n.(type) {
    case *ast.FuncDecl:
        ...    
}
```

If anyone knows a way to distinguish these, please do let me know. Thanks!

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