Raise workspace rust-version to 1.95 to match the UI crate (#1169) (#1188)

Cargo.toml

@@ -8,7 +8,7 @@ default-members = ["crates/*", "apps/pdfcraft", "apps/pdfcraft-cli", "xtask"]
 version = "0.6.0"
 edition = "2024"
 license = "MIT OR Apache-2.0"
-rust-version = "1.90"
+rust-version = "1.95"
 repository = "https://github.com/storytold/pdfcraft"
 
 [workspace.dependencies]

README.md

@@ -369,6 +369,8 @@ PdfCraft is a clean-room implementation. Its behaviour comes from the ISO 32000
 
 ## Get started
 
+Building needs Rust 1.95 or later.
+
 ```sh
 git clone https://github.com/storytold/pdfcraft
 cd pdfcraft

docs/architecture.md

@@ -8,7 +8,7 @@ crate's `README.md` has the detail.
 
 ## Shape
 
-One Cargo workspace (`Cargo.toml`, edition 2024, Rust ≥ 1.90, `MIT OR Apache-2.0`), 31 library
+One Cargo workspace (`Cargo.toml`, edition 2024, Rust ≥ 1.95, `MIT OR Apache-2.0`), 31 library
 crates in `crates/`, three binaries in `apps/`, build tooling in `xtask/`, and patched third-party
 crates in `vendor/`. About 152k lines of Rust and 1,765 tests (2026-10-10). Rust only: no
 handwritten JS/TS, in the product or the build.

docs/development.md

@@ -22,8 +22,8 @@ Cargo stores custom-profile artifacts separately under `target/low-disk`. Switch
 normal and low-disk profiles can therefore leave both sets of artifacts on disk. To remove only
 the low-disk artifacts, run `cargo clean --profile low-disk`.
 
-The UI crate and complete desktop/web builds require Rust 1.95 or later, matching the pinned
-`craft-ui` dependency. The workspace's core-crate minimum is unchanged.
+Building PdfCraft requires Rust 1.95 or later: the UI crate and its `egui` and `craft-ui`
+dependencies need it, and the workspace `rust-version` states the same minimum.
 
 ## Interface appearance
 

xtask/src/version.rs

@@ -154,4 +154,18 @@ mod tests {
         let text = std::fs::read_to_string(crate::gates::root().join("Cargo.toml")).unwrap();
         validate(&read(&text).unwrap()).unwrap();
     }
+
+    /// The `rust-version = "1.NN"` line of a manifest, as the minor number.
+    fn minor_of_rust_version(manifest: &str) -> u32 {
+        let line = manifest.lines().find(|l| l.starts_with("rust-version = \"")).unwrap();
+        line.split('"').nth(1).unwrap().split('.').nth(1).unwrap().parse().unwrap()
+    }
+
+    #[test]
+    fn workspace_rust_version_covers_the_ui_crate() {
+        let root = crate::gates::root();
+        let workspace = std::fs::read_to_string(root.join("Cargo.toml")).unwrap();
+        let ui = std::fs::read_to_string(root.join("crates/ui-egui/Cargo.toml")).unwrap();
+        assert!(minor_of_rust_version(&workspace) >= minor_of_rust_version(&ui));
+    }
 }