valgrind errors when reading files

[Anton-4]

app [main!] { pf: platform "../platform/main.roc" }

import pf.File

parse = \s ->
    s
    |> Str.splitOn "\n"
    |> List.dropFirst 1
    |> List.dropIf Str.isEmpty

main! = \_args ->
    dbg (File.read_utf8! "file" |> Result.withDefault "failed" |> parse)
    Ok {}

This was originally discovered in #295

Valgrind output:

❯ roc build examples/temp.roc --linker=legacy
0 errors and 0 warnings found in 220 ms while successfully building:

    examples/temp

basic-cli on  main [!?] is 📦 v0.0.1 via 🦀 v1.82.0 via ❄️  impure (nix-shell-env) 
❯ valgrind ./examples/temp 
==58896== Memcheck, a memory error detector
==58896== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==58896== Using Valgrind-3.23.0 and LibVEX; rerun with -h for copyright info
==58896== Command: ./examples/temp
==58896== 
==58896== Invalid read of size 8
==58896==    at 0x1344DD: decrement_refcounted_ptr_8 (roc_app:0)
==58896==    by 0x13449D: ??? (roc_app:0)
==58896==    by 0x1349F1: #Attr_#generic_rc_by_ref_1_dec (roc_app:0)
==58896==    by 0x1349F1: ??? (roc_app:0)
==58896==    by 0x12D9C8: Inspect_inspect_36ded37b63679dfb9096703c22eba74b3449a854bc97ac179ba6ffbbbaa21 (roc_app:0)
==58896==    by 0x1330B1: Inspect_toStr_9ddbc9a5a6ab79818cf720ec32ba1aeb5838e37cd919c2ff6b897d7d866d5c7 (roc_app:0)
==58896==    by 0x1331C0: #UserApp_main!_c6e34737223a4b123e4ef4b086ad92b3ead64b519536ae28b552b4718b7124e (roc_app:0)
==58896==    by 0x12ECDF: _main_for_host!_c852b6d75d2364d70d094699f8a9cda9129d5310ed82ea45564f47a9 (roc_app:0)
==58896==    by 0x12EDA4: roc__main_for_host_1_exposed_generic (roc_app:0)
==58896==    by 0x137DAB: main (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==  Address 0x4b786d0 is 0 bytes inside a block of size 1,006 free'd
==58896==    at 0x4848BD4: free (in /nix/store/qy8niksnmmfd1zim8kdw020l53agbagd-valgrind-3.23.0/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==58896==    by 0x129BA5: ??? (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x134553: decrement_refcounted_ptr_8 (roc_app:0)
==58896==    by 0x13449D: ??? (roc_app:0)
==58896==    by 0x1349F1: #Attr_#generic_rc_by_ref_1_dec (roc_app:0)
==58896==    by 0x1349F1: ??? (roc_app:0)
==58896==    by 0x12D9C8: Inspect_inspect_36ded37b63679dfb9096703c22eba74b3449a854bc97ac179ba6ffbbbaa21 (roc_app:0)
==58896==    by 0x1330B1: Inspect_toStr_9ddbc9a5a6ab79818cf720ec32ba1aeb5838e37cd919c2ff6b897d7d866d5c7 (roc_app:0)
==58896==    by 0x1331C0: #UserApp_main!_c6e34737223a4b123e4ef4b086ad92b3ead64b519536ae28b552b4718b7124e (roc_app:0)
==58896==    by 0x12ECDF: _main_for_host!_c852b6d75d2364d70d094699f8a9cda9129d5310ed82ea45564f47a9 (roc_app:0)
==58896==    by 0x12EDA4: roc__main_for_host_1_exposed_generic (roc_app:0)
==58896==    by 0x137DAB: main (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==  Block was alloc'd at
==58896==    at 0x48457D9: malloc (in /nix/store/qy8niksnmmfd1zim8kdw020l53agbagd-valgrind-3.23.0/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==58896==    by 0x1DFCCC: roc_std::roc_list::RocList<T>::extend_from_slice (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x1930CC: roc_fx_file_read_bytes (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x136C39: roc_fx_file_read_bytes_fastcc_wrapper (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x130CC0: Host_file_read_bytes!_df662f4854c7c5a297d6c339e28fd51ddc944983db9bc7f012ab2c1c69a52db6 (roc_app:0)
==58896==    by 0x12DE07: Path_read_utf8!_46df57811ab9544a1f9313aab57b6ce51825f299caf5a1ffe2569412f3ed972 (roc_app:0)
==58896==    by 0x12EC00: File_read_utf8!_539d94cac9151288c18279a5f1573e8d65d66aeb5922fa6ed8cbc577893894 (roc_app:0)
==58896==    by 0x133124: #UserApp_main!_c6e34737223a4b123e4ef4b086ad92b3ead64b519536ae28b552b4718b7124e (roc_app:0)
==58896==    by 0x12ECDF: _main_for_host!_c852b6d75d2364d70d094699f8a9cda9129d5310ed82ea45564f47a9 (roc_app:0)
==58896==    by 0x12EDA4: roc__main_for_host_1_exposed_generic (roc_app:0)
==58896==    by 0x137DAB: main (in /home/username/gitrepos/basic-cli/examples/temp)
==58896== 
==58896== Invalid write of size 8
==58896==    at 0x134506: decrement_refcounted_ptr_8 (roc_app:0)
==58896==    by 0x13449D: ??? (roc_app:0)
==58896==    by 0x1349F1: #Attr_#generic_rc_by_ref_1_dec (roc_app:0)
==58896==    by 0x1349F1: ??? (roc_app:0)
==58896==    by 0x12D9C8: Inspect_inspect_36ded37b63679dfb9096703c22eba74b3449a854bc97ac179ba6ffbbbaa21 (roc_app:0)
==58896==    by 0x1330B1: Inspect_toStr_9ddbc9a5a6ab79818cf720ec32ba1aeb5838e37cd919c2ff6b897d7d866d5c7 (roc_app:0)
==58896==    by 0x1331C0: #UserApp_main!_c6e34737223a4b123e4ef4b086ad92b3ead64b519536ae28b552b4718b7124e (roc_app:0)
==58896==    by 0x12ECDF: _main_for_host!_c852b6d75d2364d70d094699f8a9cda9129d5310ed82ea45564f47a9 (roc_app:0)
==58896==    by 0x12EDA4: roc__main_for_host_1_exposed_generic (roc_app:0)
==58896==    by 0x137DAB: main (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==  Address 0x4b786d0 is 0 bytes inside a block of size 1,006 free'd
==58896==    at 0x4848BD4: free (in /nix/store/qy8niksnmmfd1zim8kdw020l53agbagd-valgrind-3.23.0/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==58896==    by 0x129BA5: ??? (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x134553: decrement_refcounted_ptr_8 (roc_app:0)
==58896==    by 0x13449D: ??? (roc_app:0)
==58896==    by 0x1349F1: #Attr_#generic_rc_by_ref_1_dec (roc_app:0)
==58896==    by 0x1349F1: ??? (roc_app:0)
==58896==    by 0x12D9C8: Inspect_inspect_36ded37b63679dfb9096703c22eba74b3449a854bc97ac179ba6ffbbbaa21 (roc_app:0)
==58896==    by 0x1330B1: Inspect_toStr_9ddbc9a5a6ab79818cf720ec32ba1aeb5838e37cd919c2ff6b897d7d866d5c7 (roc_app:0)
==58896==    by 0x1331C0: #UserApp_main!_c6e34737223a4b123e4ef4b086ad92b3ead64b519536ae28b552b4718b7124e (roc_app:0)
==58896==    by 0x12ECDF: _main_for_host!_c852b6d75d2364d70d094699f8a9cda9129d5310ed82ea45564f47a9 (roc_app:0)
==58896==    by 0x12EDA4: roc__main_for_host_1_exposed_generic (roc_app:0)
==58896==    by 0x137DAB: main (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==  Block was alloc'd at
==58896==    at 0x48457D9: malloc (in /nix/store/qy8niksnmmfd1zim8kdw020l53agbagd-valgrind-3.23.0/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==58896==    by 0x1DFCCC: roc_std::roc_list::RocList<T>::extend_from_slice (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x1930CC: roc_fx_file_read_bytes (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x136C39: roc_fx_file_read_bytes_fastcc_wrapper (in /home/username/gitrepos/basic-cli/examples/temp)
==58896==    by 0x130CC0: Host_file_read_bytes!_df662f4854c7c5a297d6c339e28fd51ddc944983db9bc7f012ab2c1c69a52db6 (roc_app:0)
==58896==    by 0x12DE07: Path_read_utf8!_46df57811ab9544a1f9313aab57b6ce51825f299caf5a1ffe2569412f3ed972 (roc_app:0)
==58896==    by 0x12EC00: File_read_utf8!_539d94cac9151288c18279a5f1573e8d65d66aeb5922fa6ed8cbc577893894 (roc_app:0)
==58896==    by 0x133124: #UserApp_main!_c6e34737223a4b123e4ef4b086ad92b3ead64b519536ae28b552b4718b7124e (roc_app:0)
==58896==    by 0x12ECDF: _main_for_host!_c852b6d75d2364d70d094699f8a9cda9129d5310ed82ea45564f47a9 (roc_app:0)
==58896==    by 0x12EDA4: roc__main_for_host_1_exposed_generic (roc_app:0)
==58896==    by 0x137DAB: main (in /home/username/gitrepos/basic-cli/examples/temp)
==58896== 
[examples/temp.roc:12] File.read_utf8! "file" |> Result.withDefault "failed" |> parse = ["XXX"]
==58896== 
==58896== HEAP SUMMARY:
==58896==     in use at exit: 95 bytes in 2 blocks
==58896==   total heap usage: 10 allocs, 8 frees, 2,447 bytes allocated
==58896== 
==58896== LEAK SUMMARY:
==58896==    definitely lost: 72 bytes in 1 blocks
==58896==    indirectly lost: 23 bytes in 1 blocks
==58896==      possibly lost: 0 bytes in 0 blocks
==58896==    still reachable: 0 bytes in 0 blocks
==58896==         suppressed: 0 bytes in 0 blocks
==58896== Rerun with --leak-check=full to see details of leaked memory
==58896== 
==58896== For lists of detected and suppressed errors, rerun with: -s
==58896== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)