Merge branch 'main' of https://github.com/github/codeql into post-release-prep/codeql-cli-2.25.1

shared/util/codeql/util/Option.qll

@@ -56,6 +56,9 @@ module Option<TypeWithToString T> {
 
   /** Gets the given element wrapped as an `Option`. */
   Some some(T c) { result = TSome(c) }
+
+  /** Gets the `None` value. */
+  None none_() { any() }
 }
 
 /**

shared/util/codeql/util/UnboundList.qll

@@ -167,6 +167,14 @@ module Make<LocationSig Location, InputSig<Location> Input> {
      */
     bindingset[this]
     UnboundList getAPrefix() { result = [this, this.getAProperPrefix()] }
+
+    /**
+     * Holds if this list is a prefix of `other`.
+     *
+     * This is equivalent to `this = other.getAPrefix()`, but more performant.
+     */
+    bindingset[this, other]
+    predicate isPrefixOf(UnboundList other) { this = other.prefix(this.stringLength()) }
   }
 
   /** Provides predicates for constructing `UnboundList`s. */