VSCode launcher for rust using lldb

launch.json

{
 // Use IntelliSense to learn about possible attributes.
 // Hover to view descriptions of existing attributes.
 // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
 "version": "0.2.0",
 "configurations": [
  {
   "name": "Debug-LLDB",
   "type": "lldb",
   "request": "launch",
   "program": "${workspaceRoot}/target/debug/${workspaceRootFolderName}",
   "args": [],
   "cwd": "${workspaceRoot}",
   "sourceMap":{
    "/checkout/src/" : "${env:HOME}/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/"
   }
  },
  {
   "name": "Debug-GDB",
   "type": "gdb",
   "request": "launch",
   "arguments": "",
   "cwd": "${workspaceRoot}",
   "target": "${workspaceRoot}/target/debug/${workspaceRootFolderName}",
   "printCalls": true,
   "autorun": [
    "set substitute-path /checkout ${env:HOME}/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust"
   ]
  },
  {
   "name": "Debug-LLDB-Lib",
   "type": "lldb",
   "request": "launch",
   "preLaunchTask": "rust lib debug copier",
   "program": "${workspaceRoot}/target/debug/deps/${workspaceRootFolderName}",
   "args": [],
   "cwd": "${workspaceRoot}",
   "sourceMap":{
    "/checkout/src/" : "${env:HOME}/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/"
   }
  }
 ]
}

tasks.json

{
 // See https://go.microsoft.com/fwlink/?LinkId=733558
 // for the documentation about the tasks.json format
  
  // Based on info from https://github.com/rust-lang/cargo/issues/1924
  // Requires "jq" to be installed
  // Works on Linux (possibly WSL)
 "version": "2.0.0",
 "tasks": [
  {
   "type": "shell",
   "label": "rust lib debug copier",
   "command": "cp",
   "args": [
    {
     "value":
     "$(ls -1t --indicator-style=slash $(cargo test --no-run --message-format=json | jq -r 'select(.profile.test == true) | .filenames[]') | head -n1)",
     "quoting": "weak"
    },
    "${workspaceRoot}/target/debug/deps/${workspaceRootFolderName}",
   ],
   "presentation": {
    "echo": true,
    "reveal": "always",
    "focus": false,
    "panel": "shared"
   }
  }
 ]
}

Added tasks.json and Debug-LLDB-Lib to enable stepping through lib projects (unit tests and lib.rs) using a few subshells and pipes to position the most recently generated binary into a "deterministic" name. Used the jq technique to identify the binary name as listed here: rust-lang/cargo#1924