From 7cc0c9cf6763a5321949db2e59cab9ebf6d99fbb Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Fri, 12 Dec 2025 21:30:18 +0000
Subject: [PATCH 1/4] Initial plan


From e47ca9db1f9b42f699b6abd513b86d3c2179e101 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 13 Dec 2025 01:24:35 +0000
Subject: [PATCH 2/4] Keep ceres-solver-sys on edition 2021 due to cxx 1.0.x
 incompatibility with edition 2024

Co-authored-by: hombit <1784493+hombit@users.noreply.github.com>
---
 ceres-solver-sys/Cargo.toml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ceres-solver-sys/Cargo.toml b/ceres-solver-sys/Cargo.toml
index 2f0b09e..bf9a138 100644
--- a/ceres-solver-sys/Cargo.toml
+++ b/ceres-solver-sys/Cargo.toml
@@ -1,12 +1,12 @@
 [package]
 name = "ceres-solver-sys"
 version = "0.5.0"
-edition = "2024"
+edition = "2021"
 readme = "README.md"
 description = "Unsafe Rust bindings for the Ceres Solver"
 repository = "https://github.com/light-curve/ceres-solver-rs"
 license = "MIT OR Apache-2.0"
-rust-version = "1.87.0"
+rust-version = "1.67.0"
 
 [features]
 system = ["pkg-config"]

From 5d157a12948cf7a9d76399321f2d48f6faa846c8 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 13 Dec 2025 01:36:28 +0000
Subject: [PATCH 3/4] Change to edition 2021 for all crates, keep MSRV 1.87

Co-authored-by: hombit <1784493+hombit@users.noreply.github.com>
---
 Cargo.toml    | 2 +-
 src/solver.rs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 60c7840..d0288a7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "ceres-solver"
 version = "0.5.0"
-edition = "2024"
+edition = "2021"
 readme = "README.md"
 description = "Safe Rust bindings for the Ceres Solver"
 repository = "https://github.com/light-curve/ceres-solver-rs"
diff --git a/src/solver.rs b/src/solver.rs
index 13f253f..061ce4e 100644
--- a/src/solver.rs
+++ b/src/solver.rs
@@ -3,7 +3,7 @@
 use crate::error::SolverOptionsBuildingError;
 use crate::residual_block::ResidualBlockId;
 
-use ceres_solver_sys::cxx::{UniquePtr, let_cxx_string};
+use ceres_solver_sys::cxx::{let_cxx_string, UniquePtr};
 use ceres_solver_sys::ffi;
 pub use ceres_solver_sys::ffi::{
     DenseLinearAlgebraLibraryType, DoglegType, DumpFormatType, LineSearchDirectionType,

From a01b7ff89a37eb0a7ff84b53b86950f9facdf202 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 13 Dec 2025 03:10:13 +0000
Subject: [PATCH 4/4] Update ceres-solver-sys MSRV to 1.87.0

Co-authored-by: hombit <1784493+hombit@users.noreply.github.com>
---
 ceres-solver-sys/Cargo.toml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ceres-solver-sys/Cargo.toml b/ceres-solver-sys/Cargo.toml
index bf9a138..e07e772 100644
--- a/ceres-solver-sys/Cargo.toml
+++ b/ceres-solver-sys/Cargo.toml
@@ -6,7 +6,7 @@ readme = "README.md"
 description = "Unsafe Rust bindings for the Ceres Solver"
 repository = "https://github.com/light-curve/ceres-solver-rs"
 license = "MIT OR Apache-2.0"
-rust-version = "1.67.0"
+rust-version = "1.87.0"
 
 [features]
 system = ["pkg-config"]