Calling function that does not exist should produce clean error message that says so.

[waterblower]

➜  roc-learn RUST_BACKTRACE=full roc repl

  The rockin' roc repl
────────────────────────

Enter an expression, or :help, or :q to quit.

» List.map [StrElem "A", StrElem "b", NumElem 1, StrElem "c", NumElem -3] \elem ->
…     when elem is
…         NumElem num -> Num.isNegative num
…         StrElem str -> Str.isCapitalized str
… # returns [Bool.true, Bool.false, Bool.false, Bool.false, Bool.true]
thread 'main' panicked at crates/compiler/gen_dev/src/generic64/aarch64.rs:1861:13:
not yet implemented: immediate subtractions with values greater than 12bits
stack backtrace:
   0:        0x1018c716c - __mh_execute_header
   1:        0x100d0744c - __mh_execute_header
   2:        0x1018c3150 - __mh_execute_header
   3:        0x1018c6f64 - __mh_execute_header
   4:        0x1018c8680 - __mh_execute_header
   5:        0x1018c837c - __mh_execute_header
   6:        0x1018c8c84 - __mh_execute_header
   7:        0x1018c8a34 - __mh_execute_header
   8:        0x1018c7604 - __mh_execute_header
   9:        0x1018c87f4 - __mh_execute_header
  10:        0x102fa43dc - __ZN4llvm15SmallVectorBaseIyE8grow_podEPvmm
  11:        0x10113c3e8 - __mh_execute_header
  12:        0x1011ae3a4 - __mh_execute_header
  13:        0x1011a2d5c - __mh_execute_header
  14:        0x10119fc28 - __mh_execute_header
  15:        0x1016161f0 - __mh_execute_header
  16:        0x10161d7dc - __mh_execute_header
  17:        0x100ec3774 - __mh_execute_header
  18:        0x100e9f644 - __mh_execute_header
  19:        0x100e9f668 - __mh_execute_header
  20:        0x1018bb208 - __mh_execute_header

version

roc nightly pre-release, built from commit 33075285b72 on Wed May 22 09:12:12 UTC 2024

[Anton-4]

Thanks for reporting this @BlowaterNostr! isCapitalized no longer exists, I'll update the tutorial. Using Str.startsWith str "A" does not cause any problems, we should still fix this not yet implemented though.

[waterblower]

Yeah, instead of panicing, it should tell me that function XXX does not exist

[Anton-4]

I made https://github.com/roc-lang/roc/issues/6812 for improving todo error messages.

[skyqrose]

The tutorial was changed to remove isCapitalized and there's a new issue for improving the error message, so there's nothing left to do on this issue. Marking it complete.

[skyqrose]

(Of course the todo! that caused the crash still exists, so this isn't totally completed, but we don't need an issue to track that.)

[Anton-4]

I like to have issues for todo's that users actually hit. It's really easy to forget about todo!s in the code.