fix a panic

.envrc

@@ -0,0 +1 @@
+use nix

.gitignore

@@ -1,2 +1,3 @@
 /target
 /Cargo.lock
+.direnv/

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "readformat"
-version = "1.0.1"
+version = "1.0.2"
 edition = "2021"
 repository = "https://github.com/tudbut/readformat"
 license = "MIT"

shell.nix

@@ -0,0 +1,12 @@
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  nativeBuildInputs = with pkgs; [
+    rust-analyzer
+    cargo
+    rustc
+    clippy
+    rustfmt
+    cargo-watch
+  ];
+}
+

src/lib.rs

@@ -35,7 +35,7 @@ pub fn readf(format: &str, mut s: &str) -> Option<Vec<String>> {
     }
     {
         let pat = patterns[0];
-        if &s[..pat.len()] != pat {
+        if !s.get(..pat.len()).is_some_and(|x| x == pat) {
             return None;
         }
         if DEBUG {