fix: type-checking for foreach loops in trait methods (#1017)

CHANGELOG.md

@@ -37,6 +37,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Docs: correctly handle next and previous page links at the bottom of the pages when there's a separator item in the sidebar: PR [#949](https://github.com/tact-lang/tact/pull/949)
 - Docs: compilation of examples in `data-structures.mdx` and across Cookbook: PR [#917](https://github.com/tact-lang/tact/pull/917)
 - `as coins` map value serialization type is now handled correctly: PR [#987](https://github.com/tact-lang/tact/pull/987)
+- Type checking for `foreach` loops in trait methods: PR [#1017](https://github.com/tact-lang/tact/pull/1017)
 
 ### Release contributors
 

src/grammar/clone.ts

@@ -126,6 +126,7 @@ export function cloneNode<T extends AstNode>(src: T): T {
     } else if (src.kind === "statement_foreach") {
         return cloneAstNode({
             ...src,
+            map: cloneNode(src.map),
             statements: src.statements.map(cloneNode),
         });
     } else if (src.kind === "function_def") {