1 files changed, 23 insertions, 0 deletions
diff --git a/third_party/rust/semver/src/backport.rs b/third_party/rust/semver/src/backport.rs
new file mode 100644
index 0000000000..b5e1d02be5
--- /dev/null
+++ b/third_party/rust/semver/src/backport.rs
@@ -0,0 +1,23 @@
+#[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;
+
+#[cfg(no_alloc_crate)] // rustc <1.36
+pub(crate) mod alloc {
+    pub use std::alloc;
+    pub use std::vec;
+}