Merge rust-bitcoin#4223: primitives: Feature gate import

0428554 primitives: Feature gate import (Tobin C. Harding)

Pull request description:

  Feature gate the `Infallible` import. Found with `clippy`.

ACKs for top commit:
  apoelstra:
    ACK 0428554; successfully ran local tests

Tree-SHA512: 23bf7d62d81af87b67395ddee251cef82140895be76026c43c774997c29f2ed2707bf42e82d0a155a5cff83412538cb2ed5251f10c0e0cb746434a8d7db8e554

Author: apoelstra

primitives/src/transaction.rs

@@ -12,6 +12,7 @@
 
 #[cfg(feature = "alloc")]
 use core::cmp;
+#[cfg(feature = "alloc")]
 use core::convert::Infallible;
 use core::fmt;