diff --git a/compiler/load/src/file.rs b/compiler/load/src/file.rs
index 2a4bd23738..11c30c2dc7 100644
--- a/compiler/load/src/file.rs
+++ b/compiler/load/src/file.rs
@@ -2642,7 +2642,7 @@ fn parse_header<'a>(
                 opt_shorthand,
                 header_src,
                 packages,
-                exposes: header.provides.into_bump_slice(),
+                exposes: header.provides.items,
                 imports: header.imports.items,
                 to_platform: Some(header.to.value.clone()),
             };
@@ -3410,7 +3410,7 @@ fn fabricate_pkg_config_module<'a>(
     module_timing: ModuleTiming,
 ) -> (ModuleId, Msg<'a>) {
     let provides: &'a [Located<ExposesEntry<'a, &'a str>>] =
-        header.provides.clone().into_bump_slice();
+        header.provides.items;
 
     let info = PlatformHeaderInfo {
         filename,
diff --git a/compiler/parse/src/header.rs b/compiler/parse/src/header.rs
index d0c76d22c5..37475ebce1 100644
--- a/compiler/parse/src/header.rs
+++ b/compiler/parse/src/header.rs
@@ -83,7 +83,7 @@ pub struct AppHeader<'a> {
     pub name: Loc<StrLiteral<'a>>,
     pub packages: Collection<'a, Loc<PackageEntry<'a>>>,
     pub imports: Collection<'a, Loc<ImportsEntry<'a>>>,
-    pub provides: Vec<'a, Loc<ExposesEntry<'a, &'a str>>>,
+    pub provides: Collection<'a, Loc<ExposesEntry<'a, &'a str>>>,
     pub to: Loc<To<'a>>,
 
     // Potential comments and newlines - these will typically all be empty.
@@ -148,7 +148,7 @@ pub struct PlatformHeader<'a> {
     pub exposes: Vec<'a, Loc<ExposesEntry<'a, ModuleName<'a>>>>,
     pub packages: Collection<'a, Loc<PackageEntry<'a>>>,
     pub imports: Collection<'a, Loc<ImportsEntry<'a>>>,
-    pub provides: Vec<'a, Loc<ExposesEntry<'a, &'a str>>>,
+    pub provides: Collection<'a, Loc<ExposesEntry<'a, &'a str>>>,
     pub effects: Effects<'a>,
 
     // Potential comments and newlines - these will typically all be empty.
diff --git a/compiler/parse/src/module.rs b/compiler/parse/src/module.rs
index 004a17a6f8..4a31995e91 100644
--- a/compiler/parse/src/module.rs
+++ b/compiler/parse/src/module.rs
@@ -270,7 +270,7 @@ fn platform_header<'a>() -> impl Parser<'a, PlatformHeader<'a>, EHeader<'a>> {
         let (_, ((before_imports, after_imports), imports), state) =
             specialize(EHeader::Imports, imports()).parse(arena, state)?;
 
-        let (_, ((before_provides, after_provides), (provides, provides_final_comments)), state) =
+        let (_, ((before_provides, after_provides), provides), state) =
             specialize(EHeader::Provides, provides_without_to()).parse(arena, state)?;
 
         let (_, effects, state) = specialize(EHeader::Effects, effects()).parse(arena, state)?;
@@ -303,7 +303,7 @@ fn platform_header<'a>() -> impl Parser<'a, PlatformHeader<'a>, EHeader<'a>> {
 
 #[derive(Debug)]
 struct ProvidesTo<'a> {
-    entries: Vec<'a, Located<ExposesEntry<'a, &'a str>>>,
+    entries: Collection<'a, Located<ExposesEntry<'a, &'a str>>>,
     to: Located<To<'a>>,
 
     before_provides_keyword: &'a [CommentOrNewline<'a>],
@@ -342,7 +342,7 @@ fn provides_to<'a>() -> impl Parser<'a, ProvidesTo<'a>, EProvides<'a>> {
             )
         ),
         |(
-            ((before_provides_keyword, after_provides_keyword), (entries, final_comments)),
+            ((before_provides_keyword, after_provides_keyword), entries),
             ((before_to_keyword, after_to_keyword), to),
         )| {
             ProvidesTo {
@@ -362,10 +362,7 @@ fn provides_without_to<'a>() -> impl Parser<
     'a,
     (
         (&'a [CommentOrNewline<'a>], &'a [CommentOrNewline<'a>]),
-        (
-            Vec<'a, Located<ExposesEntry<'a, &'a str>>>,
-            &'a [CommentOrNewline<'a>],
-        ),
+        Collection<'a, Located<ExposesEntry<'a, &'a str>>>,
     ),
     EProvides<'a>,
 > {
diff --git a/compiler/parse/tests/test_parse.rs b/compiler/parse/tests/test_parse.rs
index 4d3fd5e2ba..b3b3779bd4 100644
--- a/compiler/parse/tests/test_parse.rs
+++ b/compiler/parse/tests/test_parse.rs
@@ -3078,7 +3078,7 @@ mod test_parse {
         let arena = Bump::new();
         let packages = Collection::empty();
         let imports = Collection::empty();
-        let provides = Vec::new_in(&arena);
+        let provides = Collection::empty();
         let module_name = StrLiteral::PlainLine("test-app");
         let header = AppHeader {
             name: Located::new(0, 0, 4, 14, module_name),
@@ -3118,7 +3118,7 @@ mod test_parse {
         let arena = Bump::new();
         let packages = Collection::empty();
         let imports = Collection::empty();
-        let provides = Vec::new_in(&arena);
+        let provides = Collection::empty();
         let module_name = StrLiteral::PlainLine("test-app");
         let header = AppHeader {
             before_header: &[],
@@ -3170,7 +3170,7 @@ mod test_parse {
         let loc_import = Located::new(2, 2, 14, 25, import);
         let imports = Collection::with_items(arena.alloc([loc_import]));
         let provide_entry = Located::new(3, 3, 15, 24, Exposed("quicksort"));
-        let provides = bumpalo::vec![in &arena; provide_entry];
+        let provides = Collection::with_items(arena.alloc([provide_entry]));
         let module_name = StrLiteral::PlainLine("quicksort");
 
         let header = AppHeader {
@@ -3255,7 +3255,7 @@ mod test_parse {
         let loc_import = Located::new(2, 6, 14, 5, import);
         let imports = Collection::with_items(arena.alloc([loc_import]));
         let provide_entry = Located::new(7, 7, 15, 24, Exposed("quicksort"));
-        let provides = bumpalo::vec![in &arena; provide_entry];
+        let provides = Collection::with_items(arena.alloc([provide_entry]));
         let module_name = StrLiteral::PlainLine("quicksort");
 
         let header = AppHeader {
@@ -3343,7 +3343,7 @@ mod test_parse {
             exposes: Vec::new_in(&arena),
             packages: Collection::empty(),
             imports: Collection::empty(),
-            provides: Vec::new_in(&arena),
+            provides: Collection::empty(),
             effects,
             after_platform_keyword: &[],
             before_requires: &[],
@@ -3387,7 +3387,7 @@ mod test_parse {
         let packages = Collection::with_items(arena.alloc([loc_pkg_entry]));
         let imports = Collection::empty();
         let provide_entry = Located::new(5, 5, 15, 26, Exposed("mainForHost"));
-        let provides = bumpalo::vec![in &arena; provide_entry];
+        let provides = Collection::with_items(arena.alloc([provide_entry]));
         let effects = Effects {
             effect_type_name: "Effect",
             effect_shortname: "fx",