feat(astUtil): Restore AST iterators + add tests for traits

The iterators in the Tact API seems broken after refactoring.

Addresses #30

Closes #29 as 'wonfix'

src/detectors/builtin/divideBeforeMultiply.ts

@@ -17,18 +17,18 @@ import {
   MistiTactError,
   Severity,
 } from "../../internals/errors";
+import {
+  forEachExpression,
+  forEachStatement,
+  foldExpressions,
+} from "../../internals/tactASTUtil";
 import {
   AstStatement,
   AstNode,
   AstExpression,
   AstOpBinary,
   SrcInfo,
 } from "@tact-lang/compiler/dist/grammar/ast";
-import { forEachExpression } from "../../internals/tactASTUtil";
-import {
-  forEachStatement,
-  foldExpressions,
-} from "@tact-lang/compiler/dist/grammar/iterators";
 
 /**
  * A detector that identifies and corrects instances of division before multiplication to

src/detectors/builtin/unboundLoops.ts

@@ -17,9 +17,12 @@ import {
   Severity,
   makeDocURL,
 } from "../../internals/errors";
-import { extractPath, forEachExpression } from "../../internals/tactASTUtil";
+import {
+  extractPath,
+  forEachExpression,
+  forEachStatement,
+} from "../../internals/tactASTUtil";
 import { AstStatement, SrcInfo } from "@tact-lang/compiler/dist/grammar/ast";
-import { forEachStatement } from "@tact-lang/compiler/dist/grammar/iterators";
 
 /**
  * A detector that analyzes loop conditions and control flow to ensure loops have proper termination criteria.

src/detectors/builtin/zeroAddress.ts

@@ -7,8 +7,8 @@ import {
   MistiTactError,
   Severity,
 } from "../../internals/errors";
+import { foldExpressions } from "../../internals/tactASTUtil";
 import { AstExpression } from "@tact-lang/compiler/dist/grammar/ast";
-import { foldExpressions } from "@tact-lang/compiler/dist/grammar/iterators";
 
 function findZeroAddress(
   ctx: MistiContext,

src/internals/exceptions.ts

@@ -3,6 +3,8 @@ import JSONbig from "json-bigint";
 
 const REPORT_TEXT =
   "Please report this output and the input sources to https://github.com/nowarp/misti/issues/new";
+const SEPARATOR =
+  "============================================================";
 
 export class TactException {
   private constructor() {}
@@ -11,9 +13,10 @@ export class TactException {
       return new Error(
         [
           "Internal Tact Compiler Error:",
+          SEPARATOR,
           error.message,
           error.stack,
-          "",
+          SEPARATOR,
           REPORT_TEXT,
         ].join("\n"),
       );
@@ -44,7 +47,7 @@ export class InternalException {
         msg,
         ...(node === undefined
           ? []
-          : [`AST node:\n${JSONbig.stringify(node, null, 2)}`]),
+          : [`${SEPARATOR}\nAST node:\n${JSONbig.stringify(node, null, 2)}`]),
         REPORT_TEXT,
       ].join("\n"),
     );