Bump minimum toolchain requirements

Author: overdrivenpotato

README.md

@@ -56,7 +56,7 @@ implementations of graphics functions, and the addition of missing libraries.
 ## Dependencies
 
 To compile for the PSP, you will need a Rust **nightly** version equal to or
-later than `2022-05-22` and the `rust-src` component. Please install Rust using
+later than `2022-06-11` and the `rust-src` component. Please install Rust using
 https://rustup.rs/
 
 Use the following if you are new to Rust. (Feel free to set an override manually

cargo-psp/src/main.rs

@@ -120,11 +120,13 @@ impl fmt::Display for CommitDate {
     }
 }
 
-// Minimum 2022-05-22, remember to update both commit date and version too, below.
-const MINIMUM_COMMIT_DATE: CommitDate = CommitDate { year: 2022, month: 05, day: 22 };
+// Minimum 2022-06-11, remember to update both commit date and version too,
+// below. Note that the `day` field lags by one day, as the toolchain always
+// contains the previous days' nightly rustc.
+const MINIMUM_COMMIT_DATE: CommitDate = CommitDate { year: 2022, month: 06, day: 10 };
 const MINIMUM_RUSTC_VERSION: Version = Version {
     major: 1,
-    minor: 62,
+    minor: 63,
     patch: 0,
     pre: Vec::new(),
     build: Vec::new(),

ci/concourse/build-rust.yml

@@ -11,8 +11,7 @@ image_resource:
     tag: 1.44-slim
 
 params:
-  RUSTFLAGS: "-C link-dead-code"
-  RUSTUP_TOOLCHAIN: nightly-2022-05-22
+  RUSTUP_TOOLCHAIN: nightly-2022-06-11
 
 inputs:
   - name: repo