bun --print breaks all bun commands: maximum nested function level reached

[LetianLi]

What version of Bun is running?

1.1.43+76800b049

What platform is your computer?

Darwin 24.1.0 arm64 arm

What steps can reproduce the bug?

1. First run the command bun --print "console.log()" to demonstrate that it prints "\n undefined" correctly.

2. Run the following command:

bun --print "`Date: ${new Date().getMonth()}/${new Date().getDate()}/${new Date().getFullYear()}`"

From this point on, all Bun CLI commands will fail in this terminal session.

3. Run any Bun command like bun --print "console.log()", or bun, or bun --revision.

What is the expected behavior?

It should return a better error if there was one.

It should not cause every bun command to fail.

What do you see instead?

Step 2 causes the process to spam "const:18: bad substitution" and end in "const:18: maximum nested function level reached; increase FUNCNEST?"

Step 3 on any bun command spams "const:19: bad substitution" and ends in "const:19: maximum nested function level reached; increase FUNCNEST?"

Any further bun commands repeats the spam with the (I assume) line number incrementing every single time.

Additional information

If bun --eval is used in step 2, it immediately exits without spam showing "zsh: bad substitution" and the usage menu (expected).

The command in step 2 was unintentionally malformed, the correct command which works is to replace " with ', or to escape the dollar signs. I did not know what bad substitution was until I looked it up today.