diff --git a/ast/src/lang/core/types.rs b/ast/src/lang/core/types.rs
index 3cb2a03f8f..8cb34c1089 100644
--- a/ast/src/lang/core/types.rs
+++ b/ast/src/lang/core/types.rs
@@ -428,7 +428,7 @@ pub fn to_type2<'a>(
             Type2::Record(field_types, ext_type)
         }
         TagUnion { tags, ext, .. } => {
-            let tag_types_vec = can_tags(env, scope, references, tags, region);
+            let tag_types_vec = can_tags(env, scope, references, tags.items, region);
 
             let tag_types = PoolVec::with_capacity(tag_types_vec.len() as u32, env.pool);
 
diff --git a/compiler/can/src/annotation.rs b/compiler/can/src/annotation.rs
index 17e0441542..a649bb850c 100644
--- a/compiler/can/src/annotation.rs
+++ b/compiler/can/src/annotation.rs
@@ -417,7 +417,7 @@ fn can_annotation_help(
         TagUnion { tags, ext, .. } => {
             let tag_types = can_tags(
                 env,
-                tags,
+                tags.items,
                 region,
                 scope,
                 var_store,
diff --git a/compiler/fmt/src/annotation.rs b/compiler/fmt/src/annotation.rs
index 4e73d91b7e..41170c7f48 100644
--- a/compiler/fmt/src/annotation.rs
+++ b/compiler/fmt/src/annotation.rs
@@ -1,6 +1,6 @@
 use crate::spaces::{fmt_comments_only, fmt_spaces, newline, NewlineAt, INDENT};
 use bumpalo::collections::String;
-use roc_parse::ast::{AssignedField, Collection, Expr, Tag, TypeAnnotation};
+use roc_parse::ast::{AssignedField, Expr, Tag, TypeAnnotation};
 use roc_region::all::Located;
 
 /// Does an AST node need parens around it?
@@ -81,9 +81,9 @@ where
 }
 
 macro_rules! format_sequence {
-    ($buf: expr, $indent:expr, $start:expr, $end:expr, $items:expr, $final_comments:expr, $newline:expr, $t:ident) => {
-        let is_multiline =
-            $items.iter().any(|item| item.value.is_multiline()) || !$final_comments.is_empty();
+    ($buf: expr, $indent:expr, $start:expr, $end:expr, $items:expr, $newline:expr, $t:ident) => {
+        let is_multiline = $items.iter().any(|item| item.value.is_multiline())
+            || !$items.final_comments.is_empty();
 
         if is_multiline {
             let braces_indent = $indent + INDENT;
@@ -138,7 +138,12 @@ macro_rules! format_sequence {
                     }
                 }
             }
-            fmt_comments_only($buf, $final_comments.iter(), NewlineAt::Top, item_indent);
+            fmt_comments_only(
+                $buf,
+                $items.final_comments.iter(),
+                NewlineAt::Top,
+                item_indent,
+            );
             newline($buf, braces_indent);
             $buf.push($end);
         } else {
@@ -192,11 +197,7 @@ impl<'a> Formattable<'a> for TypeAnnotation<'a> {
                 fields.items.iter().any(|field| field.value.is_multiline())
             }
 
-            TagUnion {
-                tags,
-                ext,
-                final_comments: _,
-            } => {
+            TagUnion { tags, ext } => {
                 match ext {
                     Some(ann) if ann.value.is_multiline() => return true,
                     _ => {}
@@ -279,36 +280,16 @@ impl<'a> Formattable<'a> for TypeAnnotation<'a> {
             BoundVariable(v) => buf.push_str(v),
             Wildcard => buf.push('*'),
 
-            TagUnion {
-                tags,
-                ext,
-                final_comments,
-            } => {
-                format_sequence!(buf, indent, '[', ']', tags, final_comments, newlines, Tag);
+            TagUnion { tags, ext } => {
+                format_sequence!(buf, indent, '[', ']', tags, newlines, Tag);
 
                 if let Some(loc_ext_ann) = *ext {
                     loc_ext_ann.value.format(buf, indent);
                 }
             }
 
-            Record {
-                fields:
-                    Collection {
-                        items,
-                        final_comments,
-                    },
-                ext,
-            } => {
-                format_sequence!(
-                    buf,
-                    indent,
-                    '{',
-                    '}',
-                    items,
-                    final_comments,
-                    newlines,
-                    AssignedField
-                );
+            Record { fields, ext } => {
+                format_sequence!(buf, indent, '{', '}', fields, newlines, AssignedField);
 
                 if let Some(loc_ext_ann) = *ext {
                     loc_ext_ann.value.format(buf, indent);
diff --git a/compiler/load/src/docs.rs b/compiler/load/src/docs.rs
index 0cbc74ea83..edadfbcd5b 100644
--- a/compiler/load/src/docs.rs
+++ b/compiler/load/src/docs.rs
@@ -235,16 +235,12 @@ fn generate_entry_doc<'a>(
 
 fn type_to_docs(in_func_type_ann: bool, type_annotation: ast::TypeAnnotation) -> TypeAnnotation {
     match type_annotation {
-        ast::TypeAnnotation::TagUnion {
-            tags,
-            ext,
-            final_comments: _,
-        } => {
+        ast::TypeAnnotation::TagUnion { tags, ext } => {
             let mut tags_to_render: Vec<Tag> = Vec::new();
 
             let mut any_tags_are_private = false;
 
-            for tag in tags {
+            for tag in tags.iter() {
                 match tag_to_doc(in_func_type_ann, tag.value) {
                     None => {
                         any_tags_are_private = true;
diff --git a/compiler/parse/src/ast.rs b/compiler/parse/src/ast.rs
index d9661f2f37..797c360018 100644
--- a/compiler/parse/src/ast.rs
+++ b/compiler/parse/src/ast.rs
@@ -266,11 +266,10 @@ pub enum TypeAnnotation<'a> {
 
     /// A tag union, e.g. `[
     TagUnion {
-        tags: &'a [Loc<Tag<'a>>],
         /// The row type variable in an open tag union, e.g. the `a` in `[ Foo, Bar ]a`.
         /// This is None if it's a closed tag union like `[ Foo, Bar]`.
         ext: Option<&'a Loc<TypeAnnotation<'a>>>,
-        final_comments: &'a [CommentOrNewline<'a>],
+        tags: Collection<'a, Loc<Tag<'a>>>,
     },
 
     /// The `*` type variable, e.g. in (List *)
diff --git a/compiler/parse/src/type_annotation.rs b/compiler/parse/src/type_annotation.rs
index 40628eb622..29065c5ed6 100644
--- a/compiler/parse/src/type_annotation.rs
+++ b/compiler/parse/src/type_annotation.rs
@@ -40,11 +40,7 @@ fn tag_union_type<'a>(min_indent: u16) -> impl Parser<'a, TypeAnnotation<'a>, ET
         )))
         .parse(arena, state)?;
 
-        let result = TypeAnnotation::TagUnion {
-            tags: tags.items,
-            ext,
-            final_comments: tags.final_comments,
-        };
+        let result = TypeAnnotation::TagUnion { tags, ext };
 
         Ok((MadeProgress, result, state))
     }