error_(sel.Pos(), `cannot define new methods on non-local type %s`, &buf)
					}
				}
			}
		}

	}
	if !sawC {
		error_(ast1.Package, `cannot find import "C"`)
	}

	// In ast2, strip the import "C" line.
	if *godefs {
		w := 0
		for _, decl := range ast2.Decls {
			d, ok := decl.(*ast.GenDecl)
			if !ok {
				ast2.Decls[w] = decl
				w++
				continue
			}
			ws := 0