Set MSRV to 1.57 so we can panic in const functions.

Author: bodil

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
                 rust:
                     - stable
                     - nightly
-                    - 1.56.0 # lowest supported version
+                    - 1.57.0 # lowest supported version
                 flags:
                     - --all-features
                     - --no-default-features
@@ -38,7 +38,7 @@ jobs:
                 rust:
                     - stable
                     - nightly
-                    - 1.56.0 # lowest supported version
+                    - 1.57.0 # lowest supported version
         steps:
             - uses: actions/checkout@v2
             - uses: actions-rs/toolchain@v1
@@ -59,7 +59,7 @@ jobs:
                 rust:
                     - stable
                     - nightly
-                    - 1.56.0 # lowest supported version
+                    - 1.57.0 # lowest supported version
         steps:
             - uses: actions/checkout@v2
             - uses: actions-rs/toolchain@v1

CHANGELOG.md

@@ -24,6 +24,8 @@ adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
     stop it now. Converting between `SmartString` and `String` using `From` and `Into` traits is
     still efficient and allocation free.
 
+-   The minimum supported rustc version is now 1.57.0.
+
 ## [0.2.10] - 2022-02-20
 
 ### CHANGED

Cargo.toml

@@ -11,7 +11,7 @@ readme = "./README.md"
 categories = ["data-structures"]
 keywords = ["cache-local", "cpu-cache", "small-string", "sso", "inline-string"]
 exclude = ["release.toml", "proptest-regressions/**"]
-rust-version = "1.56"
+rust-version = "1.57"
 
 [package.metadata.docs.rs]
 features = ["arbitrary", "proptest", "serde"]