[Bug] "workspace:./path/to/workspace" can not be resolved

[JLHwung]

• I'd be willing to implement a fix

Describe the bug

"workspace:./path/to/workspace" can not be resolved when it is in root package.json.

To Reproduce

Reproduction

const { writeFile, mkdir } = require(`fs`).promises;

await mkdir("packages/example", { recursive: true });
await writeFile(
  "packages/example/package.json",
  `{
    "name": "@workspace/example"
}`
);

await expect(packageJsonAndInstall({
  workspaces: ["packages/*"],
  devDependencies: {
    "@workspace/example": "workspace:./packages/example"
  }
})).resolves.toBeTruthy();

Environment if relevant (please complete the following information):

• Yarn version 2.1.1

Additional context

Found this issue in babel/babel#11962 (comment)

As a workaround, remove ./

"workspace:path/to/workspace"

or use

"workspace:*"

[yarnbot]

This issue reproduces on master:

Error: expect(received).resolves.toBeTruthy()

Received promise rejected instead of resolved
Rejected to value: [Error: Command failed: /usr/bin/node /github/workspace/scripts/actions/../run-yarn.js install

➤ YN0000: ┌ Resolution step
::group::Resolution step
➤ YN0001: │ Error: @workspace/example@workspace:./packages/example: Workspace not found (@workspace/example@workspace:./packages/example)
    at Project.getWorkspaceByDescriptor (/github/workspace/packages/yarnpkg-core/sources/Project.ts:387:13)
    at WorkspaceResolver.getCandidates (/github/workspace/packages/yarnpkg-core/sources/WorkspaceResolver.ts:41:36)
    at MultiResolver.getCandidates (/github/workspace/packages/yarnpkg-core/sources/MultiResolver.ts:45:27)
    at MultiResolver.getCandidates (/github/workspace/packages/yarnpkg-core/sources/MultiResolver.ts:45:27)
    at map (/github/workspace/packages/yarnpkg-core/sources/Project.ts:695:46)
    at Array.map (<anonymous>)
    at Project.resolveEverything (/github/workspace/packages/yarnpkg-core/sources/Project.ts:684:90)
    at /github/workspace/packages/yarnpkg-core/sources/Project.ts:1498:7
    at StreamReport.startTimerPromise (/github/workspace/packages/yarnpkg-core/sources/StreamReport.ts:248:14)
    at Project.install (/github/workspace/packages/yarnpkg-core/sources/Project.ts:1481:5)
::endgroup::
➤ YN0000: └ Completed
➤ YN0000: Failed with errors in 0.14s
]
    at expect (/github/workspace/.yarn/cache/expect-npm-24.8.0-8c7640c562-0ac41999f0.zip/node_modules/expect/build/index.js:138:15)
    at module.exports (evalmachine.<anonymous>:12:7)
    at async /github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:56:13
    at async executeInTempDirectory (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:17:16)
    at async Object.executeRepro (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/executeRepro.js:24:12)
    at async ExecCommand.execute (/github/workspace/.yarn/cache/@arcanis-sherlock-npm-1.0.38-d4f5e2dbf3-63f998598d.zip/node_modules/@arcanis/sherlock/lib/commands/exec.js:25:38)
    at async ExecCommand.validateAndExecute (/github/workspace/.yarn/cache/clipanion-npm-2.0.0-rc.16-b9444aaf89-a57989414f.zip/node_modules/clipanion/lib/advanced/Command.js:161:26)
    at async Cli.run (/github/workspace/.yarn/cache/clipanion-npm-2.0.0-rc.16-b9444aaf89-a57989414f.zip/node_modules/clipanion/lib/advanced/Cli.js:74:24)
    at async Cli.runExit (/github/workspace/.yarn/cache/clipanion-npm-2.0.0-rc.16-b9444aaf89-a57989414f.zip/node_modules/clipanion/lib/advanced/Cli.js:83:28)