Which standard library packages are restricted in the Go Playground, and why?

Restricted Imports in the Go Playground

The Go Playground offers a convenient environment for testing Go code snippets. However, there are certain restrictions on which packages can be imported in the Playground.

Understanding the Restrictions

The "About" button in the Playground contains the following information:

"The playground can use most of the standard library, with some exceptions."

This statement clarifies that packages from the standard library are generally importable, but not all.

Imports from the Standard Library

The standard library packages are listed under the "Standard library" section on the "Packages" page. However, packages listed under the "Other" section, such as golang.org/x/exp/ebnf, cannot be imported in the Playground.

Why the Restrictions?

The Playground's restricted imports are largely due to security and functionality considerations. Importing external packages can introduce security risks and performance issues, especially in the unrestricted environment of the Playground.

A Comprehensive Test of Standard Library Imports

To demonstrate the importability of standard library packages, the following code snippet imports every package in the standard library (excluding those without buildable Go source files):

Try it out in the Playground to see the exhaustive list of importable packages.

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