fix rust 1.94 ambiguous panic macro warnings

[cpu]

Fixes findings that have been breaking CI on main since Rust 1.94 released of the form:

error: `panic` is ambiguous
   --> src/./alg_tests.rs:699:26
    |
699 |             unhandled => panic!("extend der2text for tag 0x{unhandled:x?}"),
    |                          ^^^^^ ambiguous name
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #147319 <https://github.com/rust-lang/rust/issues/147319>
    = note: ambiguous because of a conflict between a name from a glob import and an outer scope during import or macro resolution

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.72%. Comparing base (e459078) to head (a78e859).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #449   +/-   ##
=======================================
  Coverage   96.72%   96.72%           
=======================================
  Files          20       20           
  Lines        3903     3903           
=======================================
  Hits         3775     3775           
  Misses        128      128           

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[djc]

Maybe get rid of the prelude wildcard imports anyway?

[cpu]

Maybe get rid of the prelude wildcard imports anyway?

Sure, that seems tidier: #450