Bump the MSRV to Rust 1.64

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
           - nightly
           - stable
           # MSRV
-          - 1.56.1
+          - "1.64"
     steps:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1

.rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.64"
+components = [ "rustfmt", "clippy" ]

Cargo.toml

@@ -4,7 +4,7 @@ resolver = "2"
 
 [workspace.package]
 edition = "2021"
-rust-version = "1.56"
+rust-version = "1.64"
 license = "MIT"
 readme = "README.md"
 version = "0.7.3"

include_dir/tests/integration_test.rs

@@ -57,3 +57,40 @@ fn validate_extracted(dir: &Dir, path: &Path) {
         assert!(file_path.exists());
     }
 }
+
+#[test]
+fn msrv_is_in_sync() {
+    let msrv = (include_str!("../../Cargo.toml"))
+        .lines()
+        .filter_map(|line| line.split_once(" = "))
+        .find_map(|(key, value)| {
+            if key.trim() == "rust-version" {
+                Some(value.trim().trim_matches('"'))
+            } else {
+                None
+            }
+        })
+        .unwrap();
+
+    let toolchain_version = (include_str!("../../.rust-toolchain.toml"))
+        .lines()
+        .filter_map(|line| line.split_once(" = "))
+        .find_map(|(key, value)| {
+            if key.trim() == "channel" {
+                Some(value.trim().trim_matches('"'))
+            } else {
+                None
+            }
+        })
+        .unwrap();
+    assert_eq!(toolchain_version, msrv);
+
+    let workflow_msrv = (include_str!("../../.github/workflows/main.yml"))
+        .lines()
+        .skip_while(|line| line.trim() != "# MSRV")
+        .skip(1)
+        .map(|line| line.trim().trim_start_matches('-').trim().trim_matches('"'))
+        .next()
+        .unwrap();
+    assert_eq!(workflow_msrv, msrv);
+}