Issues with repl variable initialization/red-declaration

[daggy1234]

• Version: 16.1.0un
• Platform: Darwin daggy 19.6.0 Darwin Kernel Version 19.6.0: Mon Apr 12 20:57:45 PDT 2021; root:xnu-6153.141.28.1~1/RELEASE_X86_64 x86_64 i386 MacBookPro12,1 Darwin
• Subsystem: repl

What steps will reproduce the bug?

When I declare a variable with an error during initialization, the variable name cannot be redecalred or re-created.

How often does it reproduce? Is there a required condition?

100% of the time

What is the expected behavior?

When I initialize a in the end, it shouldn't error like in the js browser consoke

What do you see instead?

Additional information

[devsnek]

Duplicate of #8309