Autofix produces invalid syntax for `else if err := ...; err != nil`

[AlwxSin]

Description

The suggested fix inserts the assignment right before ifStmt.Pos(). When the if is an else if branch, the insertion lands between else and if, producing code that doesn't compile.

Reproduce

func elseIfDefine() error {
      x := 1
      if x > 0 {
              return nil
      } else if err := f(); err != nil {
              return err
      }
      return nil
}

Applying the suggested fix yields:

      } else err := f()
      if err != nil {

which fails to parse: expected if statement or block, found err.

Affected cases

• else if err := f(); err != nil — broken on current master
• else if err = f(); err != nil — also broken after feat: support if err = doSomething(); err != nil #8 extends autofix to reassignments

Possible fix

Don't emit a SuggestedFix when the ifStmt is the Else branch of a parent *ast.IfStmt (e.g. walk with inspector.WithStack and check the parent node) — report the diagnostic message only. Alternatively, rewrite the whole else if chain, but that's much more involved.