error in helix-core when building from source on ubuntu 22.04

[insane-dreamer]

sean@newton:~$ git clone https://github.com/helix-editor/helix
cd helix
cargo install --locked --path helix-term
Cloning into 'helix'...
remote: Enumerating objects: 34281, done.
remote: Counting objects: 100% (203/203), done.
remote: Compressing objects: 100% (135/135), done.
remote: Total 34281 (delta 106), reused 138 (delta 68), pack-reused 34078
Receiving objects: 100% (34281/34281), 28.68 MiB | 16.77 MiB/s, done.
Resolving deltas: 100% (23582/23582), done.
  Installing helix-term v0.6.0 (/home/sean/helix/helix-term)
    Updating crates.io index
  Downloaded libloading v0.7.4
  Downloaded adler v1.0.2
  Downloaded pin-utils v0.1.0
  Downloaded lock_api v0.4.9
  Downloaded fnv v1.0.7
  Downloaded remove_dir_all v0.5.3
  Downloaded num_threads v0.1.6
  Downloaded dashmap v5.4.0
  Downloaded same-file v1.0.6
  Downloaded pin-project-lite v0.2.9
  Downloaded git-hashtable v0.1.0
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  Downloaded cfg-if v1.0.0
  Downloaded human_format v1.0.3
  Downloaded git-quote v0.4.0
  Downloaded hex v0.4.3
  Downloaded rustversion v1.0.9
  Downloaded log v0.4.17
  Downloaded git-validate v0.7.1
  Downloaded thiserror-impl v1.0.38
  Downloaded atoi v2.0.0
  Downloaded lazy_static v1.4.0
  Downloaded home v0.5.4
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  Downloaded signal-hook-tokio v0.3.1
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  Downloaded git-date v0.4.0
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  Downloaded git-command v0.2.1
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  Downloaded instant v0.1.12
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  Downloaded encoding_rs_io v0.1.7
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  Downloaded tokio v1.25.0
  Downloaded libc v0.2.139
  Downloaded encoding_rs v0.8.32
  Downloaded 188 crates (11.9 MB) in 1.79s (largest was `encoding_rs` at 1.4 MB)
   Compiling libc v0.2.139
   Compiling autocfg v1.1.0
   Compiling memchr v2.5.0
   Compiling cfg-if v1.0.0
   Compiling proc-macro2 v1.0.47
   Compiling version_check v0.9.4
   Compiling unicode-ident v1.0.5
   Compiling quote v1.0.21
   Compiling syn v1.0.104
   Compiling once_cell v1.17.0
   Compiling thiserror v1.0.38
   Compiling smallvec v1.10.0
   Compiling regex-automata v0.1.10
   Compiling scopeguard v1.1.0
   Compiling parking_lot_core v0.9.4
   Compiling serde v1.0.152
   Compiling serde_derive v1.0.152
   Compiling itoa v1.0.4
   Compiling log v0.4.17
   Compiling quick-error v2.0.1
   Compiling parking_lot_core v0.8.6
   Compiling crc32fast v1.3.2
   Compiling hex v0.4.3
   Compiling adler v1.0.2
   Compiling same-file v1.0.6
   Compiling bitflags v1.3.2
   Compiling bytesize v1.1.0
   Compiling human_format v1.0.3
   Compiling time-core v0.1.0
   Compiling num_threads v0.1.6
   Compiling sha1_smol v1.0.0
   Compiling minimal-lexical v0.2.1
   Compiling signal-hook v0.3.15
   Compiling regex-syntax v0.6.28
   Compiling cc v1.0.79
   Compiling anyhow v1.0.69
   Compiling fastrand v1.8.0
   Compiling remove_dir_all v0.5.3
   Compiling tinyvec_macros v0.1.0
   Compiling ryu v1.0.11
   Compiling helix-loader v0.6.0 (/home/sean/helix/helix-loader)
   Compiling static_assertions v1.1.0
   Compiling percent-encoding v2.2.0
   Compiling unicode-bidi v0.3.8
   Compiling pin-project-lite v0.2.9
   Compiling rustversion v1.0.9
   Compiling futures-core v0.3.26
   Compiling serde_json v1.0.92
   Compiling arc-swap v1.6.0
   Compiling bytes v1.3.0
   Compiling unicode-general-category v0.6.0
   Compiling smawk v0.3.1
   Compiling iana-time-zone v0.1.53
   Compiling futures-task v0.3.26
   Compiling unicode-bom v1.1.4
   Compiling str_indices v0.4.0
   Compiling unicode-width v0.1.10
   Compiling home v0.5.4
   Compiling unicode-segmentation v1.10.1
   Compiling futures-util v0.3.26
   Compiling clru v0.6.1
   Compiling either v1.8.0
   Compiling lazy_static v1.4.0
   Compiling pin-utils v0.1.0
   Compiling crossbeam-utils v0.8.14
   Compiling fnv v1.0.7
   Compiling pulldown-cmark v0.9.2
   Compiling cassowary v0.3.0
   Compiling bytecount v0.6.3
   Compiling instant v0.1.12
   Compiling encoding_rs v0.8.32
   Compiling libloading v0.7.4
   Compiling thread_local v1.1.4
   Compiling git-bitmap v0.2.0
   Compiling miniz_oxide v0.6.2
   Compiling walkdir v2.3.2
   Compiling ahash v0.7.6
   Compiling ahash v0.8.3
   Compiling slotmap v1.0.6
   Compiling unicase v2.6.0
   Compiling time-macros v0.2.6
   Compiling lock_api v0.4.9
   Compiling num-traits v0.2.15
   Compiling indexmap v1.9.2
   Compiling tokio v1.25.0
   Compiling num-integer v0.1.45
   Compiling smartstring v1.0.1
   Compiling slab v0.4.7
   Compiling tinyvec v1.6.0
   Compiling form_urlencoded v1.1.0
   Compiling ropey v1.6.0
   Compiling fuzzy-matcher v0.3.7
   Compiling tree-sitter v0.20.9
   Compiling fern v0.6.1
   Compiling encoding_rs_io v0.1.7
   Compiling bstr v1.0.1
   Compiling nom v7.1.1
   Compiling aho-corasick v0.7.20
   Compiling nom8 v0.2.0
   Compiling bstr v0.2.17
   Compiling chardetng v0.1.17
   Compiling grep-matcher v0.1.5
   Compiling content_inspector v0.2.4
   Compiling unicode-normalization v0.1.22
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   Compiling git-glob v0.5.1
   Compiling git-command v0.2.1
   Compiling regex v1.7.1
   Compiling getrandom v0.2.8
   Compiling dirs-sys-next v0.1.2
   Compiling num_cpus v1.14.0
   Compiling castaway v0.2.2
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   Compiling tempfile v3.3.0
   Compiling memmap2 v0.5.8
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   Compiling socket2 v0.4.7
   Compiling git-sec v0.6.0
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   Compiling filetime v0.2.18
   Compiling io-close v0.3.7
   Compiling which v4.4.0
   Compiling idna v0.3.0
   Compiling dirs-next v2.0.0
   Compiling compact_str v0.6.1
   Compiling threadpool v1.8.1
   Compiling parking_lot v0.12.1
   Compiling btoi v0.4.2
   Compiling atoi v2.0.0
   Compiling parking_lot v0.11.2
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   Compiling hashbrown v0.12.3
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   Compiling termini v0.1.4
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   Compiling git-revision v0.10.0
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   Compiling git-worktree v0.12.0
   Compiling git-config v0.15.0
   Compiling git-discover v0.12.0
   Compiling git-odb v0.40.0
   Compiling tokio-stream v0.1.11
   Compiling signal-hook-tokio v0.3.1
   Compiling serde_spanned v0.6.1
   Compiling toml_datetime v0.6.1
   Compiling toml_edit v0.19.1
   Compiling url v2.3.1
   Compiling git-url v0.13.0
   Compiling git-credentials v0.9.0
   Compiling lsp-types v0.94.0
   Compiling git-repository v0.32.0
   Compiling toml v0.7.1
   Compiling helix-core v0.6.0 (/home/sean/helix/helix-core)
error[E0658]: use of unstable library feature 'bool_to_option'
   --> helix-core/src/syntax.rs:430:66
    |
430 |                     .filter_map(|cap| (cap.index == capture_idx).then_some(cap.node))
    |                                                                  ^^^^^^^^^
    |
    = note: see issue #80967 <https://github.com/rust-lang/rust/issues/80967> for more information

   Compiling helix-term v0.6.0 (/home/sean/helix/helix-term)
error[E0658]: use of unstable library feature 'bool_to_option'
   --> helix-core/src/indent.rs:607:26
    |
607 |                 new_line.then_some((line, byte_pos)),
    |                          ^^^^^^^^^
    |
    = note: see issue #80967 <https://github.com/rust-lang/rust/issues/80967> for more information

error[E0658]: use of unstable library feature 'bool_to_option'
   --> helix-core/src/indent.rs:627:62
    |
627 |     let mut first_in_line = get_first_in_line(node, new_line.then_some(byte_pos));
    |                                                              ^^^^^^^^^
    |
    = note: see issue #80967 <https://github.com/rust-lang/rust/issues/80967> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `helix-core` due to 3 previous errors
warning: build failed, waiting for other jobs to finish...
error: failed to compile `helix-term v0.6.0 (/home/sean/helix/helix-term)`, intermediate artifacts can be found at `/home/sean/helix/target`

target/.rustc_info.json:

sean@newton:~/helix$ cat target/.rustc_info.json 
{"rustc_fingerprint":15650264045518534452,"outputs":{"2797684049618456168":{"success":false,"status":"exit status: 1","code":1,"stdout":"","stderr":"error: `-Csplit-debuginfo` is unstable on this platform\n\n"},"17598535894874457435":{"success":true,"status":"","code":0,"stdout":"rustc 1.61.0\nbinary: rustc\ncommit-hash: unknown\ncommit-date: unknown\nhost: x86_64-unknown-linux-gnu\nrelease: 1.61.0\nLLVM version: 14.0.0\n","stderr":""},"931469667778813386":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/usr\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""}},"successes":{}}(cpe-desktop-linux)  (master)

[pascalkuthe]

you are likely using your system installed rust toolchain instead of installing it trough rustup.

Helix requires a rust version of atleast 1.63 currently (will soon be raised to 1.65). then_some was stabilized with 1.62 I think.
Unless you are using debian (or an EOL distro) you should be able to resolve this by updating your rust compiler trough the system package manager.

Otherwise simply install rustup to obtain an updated version of rustc

[insane-dreamer]

Thanks for the quick response. Indeed Ubuntu 22.04 is at rust 1.61. Installing rust through rustup solved the issue.

[pascalkuthe]

Our MSRV policy was actually chosen to stay compatible with ubuntu. Usually they update rust to the minimum required by firefox.

It seems they managed to patch firefox 109 to build it without updating to rust 1.63 (as officially required by firefox).
However firefox 110 just released which requires rust 1.65, which is also already in the ubuntu testing repos so I guess they just skipped this version. The problem should be temporary and resolved soon.