Merge pull request #339 from dtolnay/up

Delete no_str_strip_prefix configuration

Author: dtolnay

build.rs

@@ -12,18 +12,11 @@ fn main() {
 
     if compiler >= 80 {
         println!("cargo:rustc-check-cfg=cfg(no_nonzero_bitscan)");
-        println!("cargo:rustc-check-cfg=cfg(no_str_strip_prefix)");
         println!("cargo:rustc-check-cfg=cfg(no_track_caller)");
         println!("cargo:rustc-check-cfg=cfg(no_unsafe_op_in_unsafe_fn_lint)");
         println!("cargo:rustc-check-cfg=cfg(test_node_semver)");
     }
 
-    if compiler < 45 {
-        // String::strip_prefix.
-        // https://doc.rust-lang.org/std/primitive.str.html#method.strip_prefix
-        println!("cargo:rustc-cfg=no_str_strip_prefix");
-    }
-
     if compiler < 46 {
         // #[track_caller].
         // https://blog.rust-lang.org/2020/08/27/Rust-1.46.0.html#track_caller

src/backport.rs

@@ -1,17 +1 @@
-#[cfg(no_str_strip_prefix)] // rustc <1.45
-pub(crate) trait StripPrefixExt {
-    fn strip_prefix(&self, ch: char) -> Option<&str>;
-}
-
-#[cfg(no_str_strip_prefix)]
-impl StripPrefixExt for str {
-    fn strip_prefix(&self, ch: char) -> Option<&str> {
-        if self.starts_with(ch) {
-            Some(&self[ch.len_utf8()..])
-        } else {
-            None
-        }
-    }
-}
-
 pub(crate) use crate::alloc::vec::Vec;

src/lib.rs

@@ -65,7 +65,6 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(no_unsafe_op_in_unsafe_fn_lint), deny(unsafe_op_in_unsafe_fn))]
 #![cfg_attr(no_unsafe_op_in_unsafe_fn_lint, allow(unused_unsafe))]
-#![cfg_attr(no_str_strip_prefix, allow(unstable_name_collisions))]
 #![allow(
     clippy::cast_lossless,
     clippy::cast_possible_truncation,