expr = ast.NewIdent(r.Name.Const)
				}
			}
		}

		// Copy position information from old expr into new expr,
		// in case expression being replaced is first on line.
		// See golang.org/issue/6563.
		pos := (*r.Expr).Pos()
		if x, ok := expr.(*ast.Ident); ok {
			expr = &ast.Ident{NamePos: pos, Name: x.Name}
		}

		// Change AST, because some later processing depends on it,