Use minimal dependency versions for MSRV check

Author: oxalica

.github/workflows/ci.yaml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [nightly, beta, stable, "1.56"]
+        rust: [nightly, beta, stable]
     timeout-minutes: 15
     steps:
       - name: Checkout
@@ -75,18 +75,18 @@ jobs:
           MIRIFLAGS: -Zmiri-strict-provenance
 
   minimal:
-    name: Minimal versions
+    name: MSRV 1.56
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install Rust nightly
+      - name: Install Rust
         run: |
           rustup update --no-self-update nightly
-          rustup default nightly
-          rustup component add miri
+          rustup default 1.56
+
+      - run: cargo +nightly generate-lockfile -Z minimal-versions
 
-      - run: cargo generate-lockfile -Z minimal-versions
       - run: cargo check --locked

Cargo.toml

@@ -16,9 +16,7 @@ abi_stable = { version = "0.11", default-features = false, optional = true }
 macros = { version = "0.5", package = "async-ffi-macros", path = "./macros", optional = true }
 
 [dev-dependencies]
-# tokio@1.30 has MSRV 1.63, which breaks us. Lock the version here.
-# It should not affect end-users since dev-dependencies are not merged.
-tokio = { version = "1, <1.30", features = ["macros", "rt-multi-thread", "sync", "time"] }
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "sync", "time"] }
 
 [workspace]
 

macros/Cargo.toml

@@ -14,9 +14,9 @@ rust-version = "1.56" # syn 2 requires edition 2021
 proc-macro = true
 
 [dependencies]
-proc-macro2 = "1.0"
-quote = "1.0"
-syn = { version = "2.0", features = ["full"] }
+proc-macro2 = "1"
+quote = "1"
+syn = { version = "2", features = ["full"] }
 
 [dev-dependencies]
 async-ffi.path = ".."