topiary 0.3.0

Error log

The package failed to build. The error log from opam follows.

Opam plugin "depext" may require upgrading/reinstalling. Reinstall the plugin on the current switch? [Y/n] y
The following actions will be performed:
  - recompile opam-depext 1.2.3

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved opam-depext.1.2.3  (cached)
-> removed   opam-depext.1.2.3
-> installed opam-depext.1.2.3
Done.

<><> opam-depext.1.2.3 installed successfully <><><><><><><><><><><><><><><><><>
=> opam-depext is unnecessary when used with opam >= 2.1. Please use opam install directly instead
# Run eval $(opam env) to update the current shell environment

<><> Carrying on to "opam depext -viy topiary.0.3.0 conf-rust-2021.1" <><><><><>

Since version 2.1, opam now handles external dependencies alongside OCaml ones, and the `depext` plugin interface is provided for backwards compatibility only. Consider using your usual `opam install` command to install both OCaml and system dependencies, or `opam install <pkg> --depext-only` if you want to only install external dependencies.
# Detecting depexts using vars: arch=x86_64, os=linux, os-distribution=debian, os-family=debian
# The following system packages are needed:
cargo
The following actions will be performed:
  - install conf-rust-2021 1
  - install topiary        0.3.0
===== 2 to install =====

The following system packages will first need to be installed:
    cargo

<><> Handling external dependencies <><><><><><><><><><><><><><><><><><><><><><>
Let opam run your package manager to install the required system packages?
(answer 'n' for other options) [Y/n] y
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<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved conf-rust-2021.1  (cached)
Processing  2/6: [topiary.0.3.0: http]
Processing  3/6: [topiary.0.3.0: http] [conf-rust-2021: cargo]
Processing  3/6: [conf-rust-2021: cargo]
- cargo 1.65.0
Processing  3/6: [conf-rust-2021: rustc 2021]
-> compiled  conf-rust-2021.1
Processing  3/6:
-> installed conf-rust-2021.1
Processing  4/6:
-> retrieved topiary.0.3.0  (https://github.com/tweag/topiary-opam/releases/download/v0.3.0/source-code-with-submodules.tar.xz)
Processing  5/6: [topiary: cargo build]
+ /usr/bin/cargo "build" "--release" "--package" "topiary-cli" (CWD=/home/opam/.opam/5.1/.opam-switch/build/topiary.0.3.0)
- error: package `serde_spanned v0.6.3` cannot be built because it requires rustc 1.64.0 or newer, while the currently active rustc version is 1.63.0
- Either upgrade to rustc 1.64.0 or newer, or use
- cargo update -p serde_spanned@0.6.3 --precise ver
- where `ver` is the latest version of `serde_spanned` supporting rustc 1.63.0
[ERROR] The compilation of topiary.0.3.0 failed at "cargo build --release --package topiary-cli".

#=== ERROR while compiling topiary.0.3.0 ======================================#
# context              2.1.6 | linux/x86_64 | ocaml-base-compiler.5.1.1 | file:///src
# path                 ~/.opam/5.1/.opam-switch/build/topiary.0.3.0
# command              /usr/bin/cargo build --release --package topiary-cli
# exit-code            101
# env-file             ~/.opam/log/topiary-115-0167e3.env
# output-file          ~/.opam/log/topiary-115-0167e3.out
### output ###
# error: package `serde_spanned v0.6.3` cannot be built because it requires rustc 1.64.0 or newer, while the currently active rustc version is 1.63.0
# Either upgrade to rustc 1.64.0 or newer, or use
# cargo update -p serde_spanned@0.6.3 --precise ver
# where `ver` is the latest version of `serde_spanned` supporting rustc 1.63.0



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
+- The following actions failed
| - build topiary 0.3.0
+- 
+- The following changes have been performed
| - install conf-rust-2021 1
+- 
# Run eval $(opam env) to update the current shell environment

The former state can be restored with:
    /usr/bin/opam switch import "/home/opam/.opam/5.1/.opam-switch/backup/state-20240912084013.export"
'opam --cli=2.1 install topiary.0.3.0 conf-rust-2021.1 --verbose --yes --confirm-level=unsafe-yes' failed.