cond = typecheck.TempAt(base.Pos, ir.CurFunc, types.Types[types.TBOOL])
			fn := chanfn("selectnbrecv", 2, ch.Type())
			call := mkcall1(fn, fn.Type().ResultsTuple(), r.PtrInit(), elem, ch)
			as := ir.NewAssignListStmt(r.Pos(), ir.OAS2, []ir.Node{cond, n.Lhs[1]}, []ir.Node{call})
			r.PtrInit().Append(typecheck.Stmt(as))
		}

		r.Cond = typecheck.Expr(cond)
		r.Body = cas.Body
		r.Else = append(dflt.Init(), dflt.Body...)

			// Throw away the temp to avoid plain values as statements.
			n = ir.NewBlockStmt(n.Pos(), init)
			init = nil
		}
		if len(init) > 0 {
			switch n.Op() {
			case ir.OAS, ir.OAS2, ir.OBLOCK:
				n.(ir.InitNode).PtrInit().Prepend(init...)

			default:
				init.Append(n)
				n = ir.NewBlockStmt(n.Pos(), init)
			}
		}
		return n

	// special case for a receive where we throw away
	// the value received.
	case ir.ORECV:

		return
	}

	tmp := TempAt(base.Pos, ir.CurFunc, (*np).Type())
	as := ir.NewAssignStmt(base.Pos, tmp, *np)
	as.PtrInit().Append(Stmt(ir.NewDecl(n.Pos(), ir.ODCL, tmp)))
	*np = tmp

	n.PtrInit().Append(Stmt(as))
}

// RewriteMultiValueCall rewrites multi-valued f() to use temporaries,
// so the backend wouldn't need to worry about tuple-valued expressions.

				$.each(instances[instance_id]._get_settings().plugins, function (i, val) { instances[instance_id].data[val] = {}; });
				$.each(instances[instance_id]._get_settings().plugins, function (i, val) { if(plugins[val]) { plugins[val].__init.apply(instances[instance_id]); } });
				// initialize the instance
				setTimeout(function() { if(instances[instance_id]) { instances[instance_id].init(); } }, 0);
			});
		}

	slice.SetBounded(true)
	nif.Body = []ir.Node{ir.NewAssignStmt(base.Pos, s, slice)}

	// else { s = growslice(oldPtr, newLen, oldCap, num, T) }
	call := walkGrowslice(s, nif.PtrInit(), oldPtr, newLen, oldCap, num)
	nif.Else = []ir.Node{ir.NewAssignStmt(base.Pos, s, call)}

	nodes.Append(nif)

	// Index to start copying into s.
	//   idx = newLen - len(l2)

	// See issue 24937 for more discussion.
	if cond.Op() == ir.OBYTES2STR && allCaseExprsAreSideEffectFree(sw) {
		cond := cond.(*ir.ConvExpr)
		cond.SetOp(ir.OBYTES2STRTMP)
	}

	cond = walkExpr(cond, sw.PtrInit())
	if cond.Op() != ir.OLITERAL && cond.Op() != ir.ONIL {
		cond = copyExpr(cond, cond.Type(), &sw.Compiled)
	}

	base.Pos = lno

	s := exprSwitch{
		pos:      lno,
		exprname: cond,
	}

								init = init[1:]
							}
						}
						dcl := typecheck.Stmt(ir.NewDecl(base.Pos, ir.ODCL, n.(*ir.Name)))
						ncas.PtrInit().Append(dcl)
					}
					tmp := o.newTemp(t, t.HasPointers())
					as := typecheck.Stmt(ir.NewAssignStmt(base.Pos, n, typecheck.Conv(tmp, n.Type())))
					ncas.PtrInit().Append(as)
					r.Lhs[i] = tmp
				}
				do(0, recv.X.Type().Elem())
				do(1, types.Types[types.TBOOL])

	n.Post = Stmt(n.Post)
	Stmts(n.Body)
	return n
}

// tcGoDefer typechecks (normalizes) an OGO/ODEFER statement.
func tcGoDefer(n *ir.GoDeferStmt) {
	call := normalizeGoDeferCall(n.Pos(), n.Op(), n.Call, n.PtrInit())
	call.GoDefer = true
	n.Call = call
}

// normalizeGoDeferCall normalizes call into a normal function call
// with no arguments and no results, suitable for use in an OGO/ODEFER
// statement.
//

				body = append(body, rangeAssign2(nrange, hv1t, hv2))
			} else {
				// v1 = hv1t
				body = append(body, rangeAssign(nrange, hv1t))
			}
		}
	}

	typecheck.Stmts(init)

	nfor.PtrInit().Append(init...)

	typecheck.Stmts(nfor.Cond.Init())

	nfor.Cond = typecheck.Expr(nfor.Cond)
	nfor.Cond = typecheck.DefaultLit(nfor.Cond, nil)
	nfor.Post = typecheck.Stmt(nfor.Post)
	typecheck.Stmts(body)

* 跳转到其父包（`app/` 目录）...
* 然后跳转到该包的父包（该父包并不存在，`app` 已经是最顶层的包 😱）...
* 在该父包中，找到 `dependencies` 模块（位于 `app/` 更上一级目录中的 `dependencies.py` 文件）...
* 然后从中导入函数 `get_token_header`。

这将引用 `app/` 的往上一级，带有其自己的 `__init __.py` 等文件的某个包。但是我们并没有这个包。因此，这将在我们的示例中引发错误。🚨

但是现在你知道了它的工作原理，因此无论它们多么复杂，你都可以在自己的应用程序中使用相对导入。🤓

### 添加一些自定义的 `tags`、`responses` 和 `dependencies`