remove nightly feature

src/lib.rs

@@ -8,10 +8,6 @@
 //! assert_eq!(CKSUM, 0x414fa339_u32);
 //! ```
 
-#![feature(const_eval_limit)]
-
-#![const_eval_limit = "1000000000"]
-
 /// used to generate up a [u32; 256] lookup table in `crc32`. this computes
 /// the table on demand for a given "index" `i`
 const fn table_fn(i: u32) -> u32 {
@@ -49,7 +45,12 @@ const TABLE: [u32; 256] = get_table();
 /// if used on dynamic data at runtime. Usage should generally be restricted to declaring
 /// `const` variables based on `static` or `const` data available at build time.
 pub const fn crc32(buf: &[u8]) -> u32 {
-    let mut out = !0u32;
+    crc32_seed(buf, 0)
+}
+
+#[inline]
+pub const fn crc32_seed(buf: &[u8], seed: u32) -> u32 {
+    let mut out = !seed;
     let mut i = 0usize;
     while i < buf.len() {
         out = (out >> 8) ^ TABLE[((out & 0xff) ^ (buf[i] as u32)) as usize];