public static boolean shell_parameter_expansion(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "shell_parameter_expansion")) return false;
    if (!nextTokenIs(b, LEFT_CURLY)) return false;
    boolean r, p;
    Marker m = enter_section_(b, l, _NONE_, SHELL_PARAMETER_EXPANSION, null);
    r = consumeToken(b, LEFT_CURLY);
    p = r; // pin = 1
    r = r && report_error_(b, shell_parameter_expansion_1(b, l + 1));
    r = p && consumeToken(b, RIGHT_CURLY) && r;
    exit_section_(b, l, m, r, p, null);
    return r || p;
  }
public static boolean shell_parameter_expansion(PsiBuilder b, int l)