Fix #1748: add clojure.core/ensure

CHANGELOG.md

@@ -7,6 +7,10 @@ A preview of the next release can be installed from
 
 [Babashka](https://github.com/babashka/babashka): Native, fast starting Clojure interpreter for scripting
 
+## Unreleased
+
+- [#1748](https://github.com/babashka/babashka/issues/1748): add `clojure.core/ensure`
+
 ## 1.12.194 (2024-10-12)
 
 - Upgrade to GraalVM 23

src/babashka/impl/clojure/core.clj

@@ -179,6 +179,8 @@
    'sync (sci/copy-var sync clojure-core-ns)
    'ref (sci/copy-var ref clojure-core-ns)
    'ref-set (sci/copy-var ref-set clojure-core-ns)
+   'ensure (sci/copy-var ensure clojure-core-ns)
+   ;; end STM
    'update-vals (sci/copy-var update-vals clojure-core-ns)
    'update-keys (sci/copy-var update-keys clojure-core-ns)
    'parse-boolean (sci/copy-var parse-boolean clojure-core-ns)