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-- Install paq
local execute = vim.api.nvim_command

local install_path = vim.fn.stdpath('data') .. '/site/pack/paqs/start/paq-nvim'

if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
  execute('!git clone --depth 1 https://github.com/savq/paq-nvim.git ' .. install_path)
end

require('paq') {

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Go supports nil values for certain classes of types, namely: pointers, functions, interfaces, maps, slices and channels. Nil values of these types indicate an absence of value, and vary in usability. Slices and channels are quite usable as nil values, maps less so. For pointers, interfaces and functions, besides indicating an absence, the nil value has little other usability and usually results in a panic if not checked beforehand.

And while the nil value has usability, sometimes a developer want one of the abovementioned type classes to always be non-nil. Unfortunately, Go currently does not provide an expression for such a use case.

The document explores two possible ways to provide such an expressibility, by investigating various languages that have either been designed from the ground up to support such constructs, or they have been added after the fact.

Optional-based

Some languages allow the developer to speficy whether a value is there or not by means of an Optional or similar object. Such an o

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Linux steamos 4.19.0-0.steamos2.3-amd64 #1 SMP Debian 4.19.45-1~steamos2.1 (2019-05-24) x86_64 GNU/Linux

Zotac Nen

4.6.0 Nvidia 415.27

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[ DEBUG ] 2020-02-23T20:18:33Z+0100 ] /usr/share/nvim/runtime/lua/vim/lsp.lua:607 ]	"on_lines"	1	176	40	40	41	0	0	0	{ "\t" }
[ DEBUG ] 2020-02-23T20:18:33Z+0100 ] /usr/share/nvim/runtime/lua/vim/lsp.lua:607 ]	"on_lines"	1	177	40	41	41	2	2	2	{ "\t\t" }
[ DEBUG ] 2020-02-23T20:18:33Z+0100 ] /usr/share/nvim/runtime/lua/vim/lsp/rpc.lua:269 ]	"rpc.notify"	"textDocument/didChange"	{  contentChanges = { {      text = 'package storage\n\nimport (\n\t"context"\n\t"reflect"\n\t"sort"\n\t"testing"\n\n\t"github.com/globusdigital/feature-toggles/toggle"\n\t"github.com/stretchr/testify/assert"\n)\n\nvar initialData = []toggle.Flag{\n\t{Name: "n1", ServiceName: "svc1", RawValue: "t", Value: true},\n\t{Name: "n2", ServiceName: "svc1", RawValue: "0"},\n\t{Name: "n3", ServiceName: "svc2", RawValue: "1", Value: true},\n\t{Name: "n4", ServiceName: "", RawValue: "some data"},\n\t{Name: "n5", ServiceName: "", RawValue: "y", Value: true},\n}\n\nfunc TestMem_Get(t *testing.T) {\n\ttype args struct {\n\t\tctx         context.Context\

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package pipes_test

import (
	"context"
	"crypto/md5"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"runtime"

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Reducing the special casing around the new error design draft

The error design draft is a good step in simplifying both the reading and writing of variety of code. I was even surprised that it efficiently allows readable handling of errors within http handlers:

func ListHandler(r Repo) {
  return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    handler err {
      http.Error(w, http.StatusText(500), 500) 
 }

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#!/usr/bin/python3

import os
import random
import subprocess
import sys
import urllib.request, urllib.parse, urllib.error

from os.path import isfile, join

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public class MyActivity extends AppCompatActivity {
    private MyViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        viewModel = RetainedFragment.getViewModel(
                getFragmentManager(),
                MyViewModel.class.getName(),

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// Where you setup the toolbar
        toolbarDelegate = new ToolbarCompatDelegate(toolbar);
        slider = new DrawerArrowDrawableToggle(toolbarDelegate.getActionBarThemedContext());


// DrawerLayout.DrawerListener implementation
    @Override public void onDrawerSlide(View drawerView, float slideOffset) {
          slider.setPosition(Math.min(1f, Math.max(0, slideOffset)));
    }

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package com.example.test.adapter;

import android.support.annotation.Nullable;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.transitionseverywhere.TransitionManager;