Generate glue for Set

crates/glue/src/types.rs

@@ -946,15 +946,14 @@ fn add_builtin_type<'a>(
                     Layout::Struct { field_layouts, .. },
                     Content::Structure(FlatType::Apply(Symbol::LIST_LIST, args_subs_slice)),
                 ) => {
-                    let args_tuple = env.subs.get_subs_slice(*args_subs_slice);
+                    let (key_var, val_var) = {
+                        let args_tuple = env.subs.get_subs_slice(*args_subs_slice);
 
-                    debug_assert_eq!(args_tuple.len(), 1);
+                        debug_assert_eq!(args_tuple.len(), 1);
 
-                    let (key_var, val_var) =
                         match env.subs.get_content_without_compacting(args_tuple[0]) {
                             Content::Structure(FlatType::TagUnion(union_tags, ext_var)) => {
-                                let (mut iter, _) =
-                                    union_tags.sorted_iterator_and_ext(env.subs, *ext_var);
+                                let (mut iter, _) = union_tags.sorted_iterator_and_ext(env.subs, *ext_var);
                                 let payloads = iter.next().unwrap().1;
 
                                 debug_assert_eq!(iter.next(), None);
@@ -964,7 +963,8 @@ fn add_builtin_type<'a>(
                             _ => {
                                 unreachable!()
                             }
-                        };
+                        }
+                    };
 
                     debug_assert_eq!(field_layouts.len(), 2);
 
@@ -977,14 +977,47 @@ fn add_builtin_type<'a>(
 
                     dict_id
                 }
-                _ => unreachable!("Unrecognized List element for Dict: {:?}", elem_layout),
+                (elem_layout, alias_content) => unreachable!(
+                    "Unrecognized List element for Dict. Layout was: {:?} and alias_content was: {:?}",
+                    elem_layout,
+                    alias_content
+                ),
             }
         }
         (
-            Builtin::List(_elem_layout),
-            Alias(Symbol::SET_SET, _alias_vars, _alias_var, _alias_kind),
+            Builtin::List(elem_layout),
+            Alias(Symbol::SET_SET, _alias_vars, alias_var, AliasKind::Opaque),
         ) => {
-            todo!();
+            match (
+                elem_layout,
+                env.subs.get_content_without_compacting(*alias_var),
+            ) {
+                (
+                    Layout::Struct { field_layouts, .. },
+                    Alias(Symbol::DICT_DICT, alias_args, _alias_var, AliasKind::Opaque),
+                ) => {
+                    let dict_type_vars = env.subs.get_subs_slice(alias_args.type_variables());
+
+                    debug_assert_eq!(dict_type_vars.len(), 2);
+
+                    // Sets only use the key of the Dict they wrap, not the value
+                    let elem_var = dict_type_vars[0];
+
+                    debug_assert_eq!(field_layouts.len(), 2);
+
+                    let elem_id = add_type_help(env, field_layouts[0], elem_var, opt_name, types);
+                    let set_id = types.add_anonymous(RocType::RocSet(elem_id), layout);
+
+                    types.depends(set_id, elem_id);
+
+                    set_id
+                }
+                (elem_layout, alias_content) => unreachable!(
+                    "Unrecognized List element for Set. Layout was: {:?} and alias_content was: {:?}",
+                    elem_layout,
+                    alias_content
+                ),
+            }
         }
         (Builtin::List(elem_layout), alias) => {
             unreachable!(

crates/glue/tests/fixtures/set/app.roc

@@ -4,6 +4,8 @@ app "app"
     provides [main] to pf
 
 main =
-    Dict.empty
-    |> Dict.insert "foo" "bar"
-    |> Dict.insert "baz" "blah"
+    Set.empty
+    |> Set.insert "foo"
+    |> Set.insert "bar"
+    |> Set.insert "foo"
+    |> Set.insert "baz"

crates/glue/tests/fixtures/set/platform.roc

@@ -5,5 +5,5 @@ platform "test-platform"
     imports []
     provides [mainForHost]
 
-mainForHost : Dict Str Str
+mainForHost : Set Str
 mainForHost = main

crates/glue/tests/fixtures/set/src/lib.rs

@@ -1,10 +1,10 @@
 mod test_glue;
 
-use roc_std::{RocDict, RocStr};
+use roc_std::{RocSet, RocStr};
 
 extern "C" {
     #[link_name = "roc__mainForHost_1_exposed_generic"]
-    fn roc_main(_: *mut RocDict<RocStr, RocStr>);
+    fn roc_main(_: *mut RocSet<RocStr>);
 }
 
 #[no_mangle]
@@ -12,9 +12,8 @@ pub extern "C" fn rust_main() -> i32 {
     use std::cmp::Ordering;
     use std::collections::hash_set::HashSet;
 
-    let dict = unsafe {
-        let mut ret: core::mem::MaybeUninit<RocDict<RocStr, RocStr>> =
-            core::mem::MaybeUninit::uninit();
+    let set = unsafe {
+        let mut ret: core::mem::MaybeUninit<RocSet<RocStr>> = core::mem::MaybeUninit::uninit();
 
         roc_main(ret.as_mut_ptr());
 
@@ -23,20 +22,21 @@ pub extern "C" fn rust_main() -> i32 {
 
     // Verify that it has all the expected traits.
 
-    assert!(dict == dict); // PartialEq
-    assert!(dict.clone() == dict.clone()); // Clone
+    assert!(set == set); // PartialEq
+    assert_eq!(set.len(), 3); // len
+    assert!(set.clone() == set.clone()); // Clone
 
-    assert!(dict.partial_cmp(&dict) == Some(Ordering::Equal)); // PartialOrd
-    assert!(dict.cmp(&dict) == Ordering::Equal); // Ord
+    assert!(set.partial_cmp(&set) == Some(Ordering::Equal)); // PartialOrd
+    assert!(set.cmp(&set) == Ordering::Equal); // Ord
 
-    let mut set = HashSet::new();
+    let mut hash_set = HashSet::new();
 
-    set.insert(dict.clone()); // Eq, Hash
-    set.insert(dict.clone());
+    hash_set.insert(set.clone()); // Eq, Hash
+    hash_set.insert(set.clone());
 
-    assert_eq!(set.len(), 1);
+    assert_eq!(hash_set.len(), 1);
 
-    println!("dict was: {:?}", dict); // Debug
+    println!("set was: {:?}", set); // Debug
 
     // Exit code
     0

crates/glue/tests/test_glue_cli.rs

@@ -74,7 +74,7 @@ mod glue_cli_run {
             dict was: RocDict {"foo": "bar", "baz": "blah"}
         "#),
         set:"set" => indoc!(r#"
-            set was: RocSet ["foo", "bar", "baz"]
+            set was: RocSet {"foo", "bar", "baz"}
         "#),
         enumeration:"enumeration" => "tag_union was: MyEnum::Foo, Bar is: MyEnum::Bar, Baz is: MyEnum::Baz\n",
         union_with_padding:"union-with-padding" => indoc!(r#"