Repro in Python:

import qsharp
qsharp.init(target_profile=qsharp.TargetProfile.Base)
qsharp.eval("let y = x;")

Expected: Qsc.Resolve.NotFound (so far this is OK)

in a separate REPL / notebook line:

qsharp.eval("y")

PANIC

thread '<unnamed>' panicked at source/compiler/qsc_rca/src/applications.rs:610:14:
local compute kind does not exist

If the same code is run in the Unrestricted profile, you'll get an expected runtime error:

module.QSharpError: Qsc.Eval.UnboundName

  × runtime error
  ╰─▶ name is not bound
   ╭─[line_1:1:1]
 1 │ y
   · ─
   ╰────

We dodge this panic when we're in unrestricted, because we don't run FIR passes when we're in unrestricted.

Repros in qsharp 1.20.0