diff --git a/libnixf/include/nixf/Basic/Nodes/Expr.h b/libnixf/include/nixf/Basic/Nodes/Expr.h
index 344491864..b22c60b10 100644
--- a/libnixf/include/nixf/Basic/Nodes/Expr.h
+++ b/libnixf/include/nixf/Basic/Nodes/Expr.h
@@ -55,7 +55,8 @@ class ExprCall : public Expr {
 
   [[nodiscard]] ChildVector children() const override {
     ChildVector Children;
-    Children.reserve(Args.size());
+    Children.reserve(Args.size() + 1);
+    Children.emplace_back(Fn.get());
     for (const auto &Member : Args) {
       Children.emplace_back(Member.get());
     }
@@ -157,19 +158,25 @@ class ExprLet : public Expr {
 };
 
 class ExprWith : public Expr {
+  std::shared_ptr<Misc> KwWith;
+  std::shared_ptr<Misc> TokSemi;
   std::shared_ptr<Expr> With;
   std::shared_ptr<Expr> E;
 
 public:
-  ExprWith(LexerCursorRange Range, std::shared_ptr<Expr> With,
+  ExprWith(LexerCursorRange Range, std::shared_ptr<Misc> KwWith,
+           std::shared_ptr<Misc> TokSemi, std::shared_ptr<Expr> With,
            std::shared_ptr<Expr> E)
-      : Expr(NK_ExprWith, Range), With(std::move(With)), E(std::move(E)) {}
+      : Expr(NK_ExprWith, Range), KwWith(std::move(KwWith)),
+        TokSemi(std::move(TokSemi)), With(std::move(With)), E(std::move(E)) {}
 
+  [[nodiscard]] const Misc &kwWith() const { return *KwWith; }
+  [[nodiscard]] const Misc *tokSemi() const { return TokSemi.get(); }
   [[nodiscard]] Expr *with() const { return With.get(); }
   [[nodiscard]] Expr *expr() const { return E.get(); }
 
   [[nodiscard]] ChildVector children() const override {
-    return {With.get(), E.get()};
+    return {KwWith.get(), TokSemi.get(), With.get(), E.get()};
   }
 };
 
diff --git a/libnixf/include/nixf/Basic/Nodes/Simple.h b/libnixf/include/nixf/Basic/Nodes/Simple.h
index a2f99ab30..0dce92190 100644
--- a/libnixf/include/nixf/Basic/Nodes/Simple.h
+++ b/libnixf/include/nixf/Basic/Nodes/Simple.h
@@ -103,7 +103,14 @@ class InterpolatedParts : public Node {
     return Fragments[0].escaped();
   }
 
-  [[nodiscard]] ChildVector children() const override { return {}; }
+  [[nodiscard]] ChildVector children() const override {
+    ChildVector Children;
+    for (const auto &Frag : Fragments) {
+      if (Frag.kind() == InterpolablePart::SPK_Interpolation)
+        Children.emplace_back(&Frag.interpolation());
+    }
+    return Children;
+  }
 };
 
 class ExprString : public Expr {
@@ -130,7 +137,7 @@ class ExprString : public Expr {
     return Parts->literal();
   }
 
-  [[nodiscard]] ChildVector children() const override { return {}; }
+  [[nodiscard]] ChildVector children() const override { return {Parts.get()}; }
 };
 
 class ExprPath : public Expr {
diff --git a/libnixf/src/Parse/ParseExpr.cpp b/libnixf/src/Parse/ParseExpr.cpp
index 1d7a5c0ab..654528661 100644
--- a/libnixf/src/Parse/ParseExpr.cpp
+++ b/libnixf/src/Parse/ParseExpr.cpp
@@ -280,6 +280,8 @@ std::shared_ptr<ExprWith> Parser::parseExprWith() {
   assert(TokWith.kind() == tok_kw_with && "token should be tok_kw_with");
 
   consume(); // with
+
+  auto KwWith = std::make_shared<Misc>(TokWith.range());
   assert(LastToken && "LastToken should be set after consume()");
 
   auto SyncSemi = withSync(tok_semi_colon);
@@ -294,9 +296,11 @@ std::shared_ptr<ExprWith> Parser::parseExprWith() {
     ExpSemi.diag().note(Note::NK_ToMachThis, TokWith.range())
         << std::string(tok::spelling(tok_kw_with));
     return std::make_shared<ExprWith>(LexerCursorRange{LCur, LastToken->rCur()},
+                                      std::move(KwWith), /*TokSemi*/ nullptr,
                                       std::move(With), /*E=*/nullptr);
   }
 
+  auto TokSemi = std::make_shared<Misc>(ExpSemi.tok().range());
   consume(); // ;
 
   auto E = parseExpr();
@@ -305,6 +309,7 @@ std::shared_ptr<ExprWith> Parser::parseExprWith() {
     diagNullExpr(Diags, LastToken->rCur(), "with body");
 
   return std::make_shared<ExprWith>(LexerCursorRange{LCur, LastToken->rCur()},
+                                    std::move(KwWith), std::move(TokSemi),
                                     std::move(With), std::move(E));
 }
 
diff --git a/libnixf/test/Basic/Nodes.cpp b/libnixf/test/Basic/Nodes.cpp
index 0ed3c9e0f..385db1247 100644
--- a/libnixf/test/Basic/Nodes.cpp
+++ b/libnixf/test/Basic/Nodes.cpp
@@ -36,4 +36,21 @@ TEST(Node, InterpolateLiteralFalse) {
   ASSERT_FALSE(Parts.isLiteral());
 }
 
+TEST(Node, ExprCall_Children) {
+  auto Src = "foo bar baz"sv;
+  std::vector<Diagnostic> Diag;
+  auto Root = parse(Src, Diag);
+
+  ASSERT_EQ(Root->children().size(), 3);
+}
+
+TEST(Node, ExprString_Children) {
+  auto Src = R"("foo${baz}")"sv;
+  std::vector<Diagnostic> Diag;
+  auto Root = parse(Src, Diag);
+
+  ASSERT_EQ(Root->children().size(), 1);
+  ASSERT_EQ(Root->children()[0]->children().size(), 1);
+}
+
 } // namespace