Rust: Macro call resolution

Author: hvitved

rust/ql/integration-tests/hello-workspace/lib/src/a_module/mod.rs

@@ -1,3 +1,3 @@
 pub fn hello() {
-    println!("Hello, world!");
+    println!("Hello, world!"); // $ item=println
 } // HELLO

rust/ql/lib/codeql/rust/elements/internal/MacroCallImpl.qll

@@ -12,6 +12,7 @@ private import codeql.rust.elements.internal.generated.MacroCall
  */
 module Impl {
   private import rust
+  private import codeql.rust.internal.PathResolution
 
   pragma[nomagic]
   predicate isInMacroExpansion(AstNode root, AstNode n) {
@@ -44,5 +45,12 @@ module Impl {
       isInMacroExpansion(this, result) and
       this.getTokenTree().getLocation().contains(result.getLocation())
     }
+
+    /**
+     * Gets the macro definition that this macro call resolves to.
+     *
+     * The result is either a `MacroDef` or a `MacroRules`.
+     */
+    Item resolveMacro() { result = resolvePath(this.getPath()) }
   }
 }