Got inlne enums working in most places

9 files changed, 422 insertions, 45 deletions

diff --git a/src/ast.c b/src/ast.c
index d59058c9..7d5e7b65 100644
--- a/src/ast.c
+++ b/src/ast.c
@@ -446,3 +446,321 @@ CONSTFUNC ast_e binop_tag(ast_e tag) {
     default: return Unknown;
     }
 }
+
+static void ast_visit_list(ast_list_t *ast_list, void (*visitor)(ast_t *, void *), void *userdata) {
+    for (ast_list_t *ast = ast_list; ast; ast = ast->next)
+        ast_visit(ast->ast, visitor, userdata);
+}
+
+static void ast_visit_args(arg_ast_t *args, void (*visitor)(ast_t *, void *), void *userdata) {
+    for (arg_ast_t *arg = args; arg; arg = arg->next)
+        ast_visit(arg->value, visitor, userdata);
+}
+
+void ast_visit(ast_t *ast, void (*visitor)(ast_t *, void *), void *userdata) {
+    if (!ast) return;
+    visitor(ast, userdata);
+
+    switch (ast->tag) {
+    case Unknown:
+    case None:
+    case Bool:
+    case Var:
+    case Int:
+    case Num:
+    case Path:
+    case TextLiteral: return;
+    case TextJoin: ast_visit_list(Match(ast, TextJoin)->children, visitor, userdata); return;
+    case Declare: {
+        DeclareMatch(decl, ast, Declare);
+        ast_visit(decl->var, visitor, userdata);
+        ast_visit(decl->value, visitor, userdata);
+        return;
+    }
+    case Assign: {
+        DeclareMatch(assign, ast, Assign);
+        ast_visit_list(assign->targets, visitor, userdata);
+        ast_visit_list(assign->values, visitor, userdata);
+        return;
+    }
+    case BINOP_CASES: {
+        binary_operands_t op = BINARY_OPERANDS(ast);
+        ast_visit(op.lhs, visitor, userdata);
+        ast_visit(op.rhs, visitor, userdata);
+        return;
+    }
+    case Negative: {
+        ast_visit(Match(ast, Negative)->value, visitor, userdata);
+        return;
+    }
+    case Not: {
+        ast_visit(Match(ast, Not)->value, visitor, userdata);
+        return;
+    }
+    case HeapAllocate: {
+        ast_visit(Match(ast, HeapAllocate)->value, visitor, userdata);
+        return;
+    }
+    case StackReference: {
+        ast_visit(Match(ast, StackReference)->value, visitor, userdata);
+        return;
+    }
+    case Min: {
+        DeclareMatch(min, ast, Min);
+        ast_visit(min->lhs, visitor, userdata);
+        ast_visit(min->key, visitor, userdata);
+        ast_visit(min->rhs, visitor, userdata);
+        return;
+    }
+    case Max: {
+        DeclareMatch(max, ast, Max);
+        ast_visit(max->lhs, visitor, userdata);
+        ast_visit(max->key, visitor, userdata);
+        ast_visit(max->rhs, visitor, userdata);
+        return;
+    }
+    case List: {
+        ast_visit_list(Match(ast, List)->items, visitor, userdata);
+        return;
+    }
+    case Set: {
+        ast_visit_list(Match(ast, Set)->items, visitor, userdata);
+        return;
+    }
+    case Table: {
+        DeclareMatch(table, ast, Table);
+        ast_visit_list(table->entries, visitor, userdata);
+        ast_visit(table->default_value, visitor, userdata);
+        ast_visit(table->fallback, visitor, userdata);
+        return;
+    }
+    case TableEntry: {
+        DeclareMatch(entry, ast, TableEntry);
+        ast_visit(entry->key, visitor, userdata);
+        ast_visit(entry->value, visitor, userdata);
+        return;
+    }
+    case Comprehension: {
+        DeclareMatch(comp, ast, Comprehension);
+        ast_visit(comp->expr, visitor, userdata);
+        ast_visit_list(comp->vars, visitor, userdata);
+        ast_visit(comp->iter, visitor, userdata);
+        ast_visit(comp->filter, visitor, userdata);
+        return;
+    }
+    case FunctionDef: {
+        DeclareMatch(def, ast, FunctionDef);
+        ast_visit(def->name, visitor, userdata);
+        ast_visit_args(def->args, visitor, userdata);
+        ast_visit(def->body, visitor, userdata);
+        return;
+    }
+    case ConvertDef: {
+        DeclareMatch(def, ast, ConvertDef);
+        ast_visit_args(def->args, visitor, userdata);
+        ast_visit(def->body, visitor, userdata);
+        return;
+    }
+    case Lambda: {
+        DeclareMatch(lambda, ast, Lambda);
+        ast_visit_args(lambda->args, visitor, userdata);
+        ast_visit(lambda->body, visitor, userdata);
+        return;
+    }
+    case FunctionCall: {
+        DeclareMatch(call, ast, FunctionCall);
+        ast_visit(call->fn, visitor, userdata);
+        ast_visit_args(call->args, visitor, userdata);
+        return;
+    }
+    case MethodCall: {
+        DeclareMatch(call, ast, MethodCall);
+        ast_visit(call->self, visitor, userdata);
+        ast_visit_args(call->args, visitor, userdata);
+        return;
+    }
+    case Block: {
+        ast_visit_list(Match(ast, Block)->statements, visitor, userdata);
+        return;
+    }
+    case For: {
+        DeclareMatch(for_, ast, For);
+        ast_visit_list(for_->vars, visitor, userdata);
+        ast_visit(for_->iter, visitor, userdata);
+        ast_visit(for_->body, visitor, userdata);
+        ast_visit(for_->empty, visitor, userdata);
+        return;
+    }
+    case While: {
+        DeclareMatch(while_, ast, While);
+        ast_visit(while_->condition, visitor, userdata);
+        ast_visit(while_->body, visitor, userdata);
+        return;
+    }
+    case Repeat: {
+        ast_visit(Match(ast, Repeat)->body, visitor, userdata);
+        return;
+    }
+    case If: {
+        DeclareMatch(if_, ast, If);
+        ast_visit(if_->condition, visitor, userdata);
+        ast_visit(if_->body, visitor, userdata);
+        ast_visit(if_->else_body, visitor, userdata);
+        return;
+    }
+    case When: {
+        DeclareMatch(when, ast, When);
+        ast_visit(when->subject, visitor, userdata);
+        for (when_clause_t *clause = when->clauses; clause; clause = clause->next) {
+            ast_visit(clause->pattern, visitor, userdata);
+            ast_visit(clause->body, visitor, userdata);
+        }
+        ast_visit(when->else_body, visitor, userdata);
+        return;
+    }
+    case Reduction: {
+        DeclareMatch(reduction, ast, Reduction);
+        ast_visit(reduction->key, visitor, userdata);
+        ast_visit(reduction->iter, visitor, userdata);
+        return;
+    }
+    case Skip:
+    case Stop:
+    case Pass: return;
+    case Defer: {
+        ast_visit(Match(ast, Defer)->body, visitor, userdata);
+        return;
+    }
+    case Return: {
+        ast_visit(Match(ast, Return)->value, visitor, userdata);
+        return;
+    }
+    case Extern: return;
+    case StructDef: {
+        DeclareMatch(def, ast, StructDef);
+        ast_visit_args(def->fields, visitor, userdata);
+        ast_visit(def->namespace, visitor, userdata);
+        return;
+    }
+    case EnumDef: {
+        DeclareMatch(def, ast, EnumDef);
+        for (tag_ast_t *tag = def->tags; tag; tag = tag->next)
+            ast_visit_args(tag->fields, visitor, userdata);
+        ast_visit(def->namespace, visitor, userdata);
+        return;
+    }
+    case LangDef: {
+        ast_visit(Match(ast, LangDef)->namespace, visitor, userdata);
+        return;
+    }
+    case Index: {
+        DeclareMatch(index, ast, Index);
+        ast_visit(index->indexed, visitor, userdata);
+        ast_visit(index->index, visitor, userdata);
+        return;
+    }
+    case FieldAccess: {
+        ast_visit(Match(ast, FieldAccess)->fielded, visitor, userdata);
+        return;
+    }
+    case Optional: {
+        ast_visit(Match(ast, Optional)->value, visitor, userdata);
+        return;
+    }
+    case NonOptional: {
+        ast_visit(Match(ast, NonOptional)->value, visitor, userdata);
+        return;
+    }
+    case DocTest: {
+        DeclareMatch(test, ast, DocTest);
+        ast_visit(test->expr, visitor, userdata);
+        ast_visit(test->expected, visitor, userdata);
+        return;
+    }
+    case Assert: {
+        DeclareMatch(assert, ast, Assert);
+        ast_visit(assert->expr, visitor, userdata);
+        ast_visit(assert->message, visitor, userdata);
+        return;
+    }
+    case Use: {
+        ast_visit(Match(ast, Use)->var, visitor, userdata);
+        return;
+    }
+    case InlineCCode: {
+        ast_visit_list(Match(ast, InlineCCode)->chunks, visitor, userdata);
+        return;
+    }
+    case Deserialize: {
+        ast_visit(Match(ast, Deserialize)->value, visitor, userdata);
+        return;
+    }
+    case Extend: {
+        ast_visit(Match(ast, Extend)->body, visitor, userdata);
+        return;
+    }
+    default: errx(1, "Visiting is not supported for this AST: %s", Text$as_c_string(ast_to_sexp(ast)));
+#undef T
+    }
+}
+
+static void _type_ast_visit(ast_t *ast, void *userdata) {
+    void (*visit)(type_ast_t *, void *) = ((Closure_t *)userdata)->fn;
+    userdata = ((Closure_t *)userdata)->userdata;
+
+    switch (ast->tag) {
+    case Declare: {
+        visit(Match(ast, Declare)->type, userdata);
+        break;
+    }
+    case FunctionDef: {
+        for (arg_ast_t *arg = Match(ast, FunctionDef)->args; arg; arg = arg->next)
+            visit(arg->type, userdata);
+        visit(Match(ast, FunctionDef)->ret_type, userdata);
+        break;
+    }
+    case Lambda: {
+        for (arg_ast_t *arg = Match(ast, Lambda)->args; arg; arg = arg->next)
+            visit(arg->type, userdata);
+        visit(Match(ast, Lambda)->ret_type, userdata);
+        break;
+    }
+    case ConvertDef: {
+        for (arg_ast_t *arg = Match(ast, ConvertDef)->args; arg; arg = arg->next)
+            visit(arg->type, userdata);
+        visit(Match(ast, ConvertDef)->ret_type, userdata);
+        break;
+    }
+    case StructDef: {
+        for (arg_ast_t *field = Match(ast, StructDef)->fields; field; field = field->next)
+            visit(field->type, userdata);
+        break;
+    }
+    case EnumDef: {
+        for (tag_ast_t *tag = Match(ast, EnumDef)->tags; tag; tag = tag->next) {
+            for (arg_ast_t *field = tag->fields; field; field = field->next) {
+                visit(field->type, userdata);
+            }
+        }
+        break;
+    }
+    case InlineCCode: {
+        visit(Match(ast, InlineCCode)->type_ast, userdata);
+        break;
+    }
+    case Deserialize: {
+        visit(Match(ast, Deserialize)->type, userdata);
+        break;
+    }
+    case Extern: {
+        visit(Match(ast, Extern)->type, userdata);
+        break;
+    }
+    default: break;
+    }
+}
+
+void type_ast_visit(ast_t *ast, void (*visitor)(type_ast_t *, void *), void *userdata) {
+    Closure_t fn = {.fn = visitor, .userdata = userdata};
+    ast_visit(ast, _type_ast_visit, &fn);
+}
diff --git a/src/ast.h b/src/ast.h
index 2e562514..29141490 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -91,6 +91,7 @@ typedef enum {
 } type_ast_e;
 
 typedef struct tag_ast_s {
+    file_t *file;
     const char *start, *end;
     const char *name;
     arg_ast_t *fields;
@@ -503,3 +504,5 @@ void visit_topologically(ast_list_t *ast, Closure_t fn);
 CONSTFUNC bool is_update_assignment(ast_t *ast);
 CONSTFUNC ast_e binop_tag(ast_e tag);
 CONSTFUNC bool is_binary_operation(ast_t *ast);
+void ast_visit(ast_t *ast, void (*visitor)(ast_t *, void *), void *userdata);
+void type_ast_visit(ast_t *ast, void (*visitor)(type_ast_t *, void *), void *userdata);
diff --git a/src/compile/enums.c b/src/compile/enums.c
index f5500831..f8a3994e 100644
--- a/src/compile/enums.c
+++ b/src/compile/enums.c
@@ -8,15 +8,13 @@
 #include "../typecheck.h"
 #include "compilation.h"
 
-Text_t compile_enum_typeinfo(env_t *env, ast_t *ast) {
-    DeclareMatch(def, ast, EnumDef);
-
+Text_t compile_enum_typeinfo(env_t *env, const char *name, tag_ast_t *tags) {
     // Compile member types and constructors:
     Text_t member_typeinfos = EMPTY_TEXT;
-    for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
+    for (tag_ast_t *tag = tags; tag; tag = tag->next) {
         if (!tag->fields) continue;
 
-        const char *tag_name = String(def->name, "$", tag->name);
+        const char *tag_name = String(name, "$", tag->name);
         type_t *tag_type = Table$str_get(*env->types, tag_name);
         assert(tag_type && tag_type->tag == StructType);
         member_typeinfos =
@@ -24,21 +22,21 @@ Text_t compile_enum_typeinfo(env_t *env, ast_t *ast) {
     }
 
     int num_tags = 0;
-    for (tag_ast_t *t = def->tags; t; t = t->next)
+    for (tag_ast_t *t = tags; t; t = t->next)
         num_tags += 1;
 
-    type_t *t = Table$str_get(*env->types, def->name);
+    type_t *t = Table$str_get(*env->types, name);
     const char *metamethods = is_packed_data(t) ? "PackedDataEnum$metamethods" : "Enum$metamethods";
-    Text_t info = namespace_name(env, env->namespace, Texts(def->name, "$$info"));
+    Text_t info = namespace_name(env, env->namespace, Texts(name, "$$info"));
     Text_t typeinfo =
         Texts("public const TypeInfo_t ", info, " = {", (int64_t)type_size(t), "u, ", (int64_t)type_align(t),
-              "u, .metamethods=", metamethods, ", {.tag=EnumInfo, .EnumInfo={.name=\"", def->name,
+              "u, .metamethods=", metamethods, ", {.tag=EnumInfo, .EnumInfo={.name=\"", name,
               "\", "
               ".num_tags=",
               (int64_t)num_tags, ", .tags=(NamedType_t[]){");
 
-    for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
-        const char *tag_type_name = String(def->name, "$", tag->name);
+    for (tag_ast_t *tag = tags; tag; tag = tag->next) {
+        const char *tag_type_name = String(name, "$", tag->name);
         type_t *tag_type = Table$str_get(*env->types, tag_type_name);
         if (tag_type && Match(tag_type, StructType)->fields)
             typeinfo = Texts(typeinfo, "{\"", tag->name, "\", ", compile_type_info(tag_type), "}, ");
@@ -48,10 +46,9 @@ Text_t compile_enum_typeinfo(env_t *env, ast_t *ast) {
     return Texts(member_typeinfos, typeinfo);
 }
 
-Text_t compile_enum_constructors(env_t *env, ast_t *ast) {
-    DeclareMatch(def, ast, EnumDef);
+Text_t compile_enum_constructors(env_t *env, const char *name, tag_ast_t *tags) {
     Text_t constructors = EMPTY_TEXT;
-    for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
+    for (tag_ast_t *tag = tags; tag; tag = tag->next) {
         if (!tag->fields) continue;
 
         Text_t arg_sig = EMPTY_TEXT;
@@ -61,9 +58,9 @@ Text_t compile_enum_constructors(env_t *env, ast_t *ast) {
             if (field->next) arg_sig = Texts(arg_sig, ", ");
         }
         if (arg_sig.length == 0) arg_sig = Text("void");
-        Text_t type_name = namespace_name(env, env->namespace, Texts(def->name, "$$type"));
-        Text_t tagged_name = namespace_name(env, env->namespace, Texts(def->name, "$tagged$", tag->name));
-        Text_t tag_name = namespace_name(env, env->namespace, Texts(def->name, "$tag$", tag->name));
+        Text_t type_name = namespace_name(env, env->namespace, Texts(name, "$$type"));
+        Text_t tagged_name = namespace_name(env, env->namespace, Texts(name, "$tagged$", tag->name));
+        Text_t tag_name = namespace_name(env, env->namespace, Texts(name, "$tag$", tag->name));
         Text_t constructor_impl = Texts("public inline ", type_name, " ", tagged_name, "(", arg_sig, ") { return (",
                                         type_name, "){.$tag=", tag_name, ", .", valid_c_name(tag->name), "={");
         for (arg_ast_t *field = tag->fields; field; field = field->next) {
@@ -76,16 +73,15 @@ Text_t compile_enum_constructors(env_t *env, ast_t *ast) {
     return constructors;
 }
 
-Text_t compile_enum_header(env_t *env, ast_t *ast) {
-    DeclareMatch(def, ast, EnumDef);
+Text_t compile_enum_header(env_t *env, const char *name, tag_ast_t *tags) {
     Text_t all_defs = EMPTY_TEXT;
-    Text_t none_name = namespace_name(env, env->namespace, Texts(def->name, "$none"));
-    Text_t enum_name = namespace_name(env, env->namespace, Texts(def->name, "$$enum"));
+    Text_t none_name = namespace_name(env, env->namespace, Texts(name, "$none"));
+    Text_t enum_name = namespace_name(env, env->namespace, Texts(name, "$$enum"));
     Text_t enum_tags = Texts("{ ", none_name, "=0, ");
 
     bool has_any_tags_with_fields = false;
-    for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
-        Text_t tag_name = namespace_name(env, env->namespace, Texts(def->name, "$tag$", tag->name));
+    for (tag_ast_t *tag = tags; tag; tag = tag->next) {
+        Text_t tag_name = namespace_name(env, env->namespace, Texts(name, "$tag$", tag->name));
         enum_tags = Texts(enum_tags, tag_name);
         if (tag->next) enum_tags = Texts(enum_tags, ", ");
         has_any_tags_with_fields = has_any_tags_with_fields || (tag->fields != NULL);
@@ -94,32 +90,32 @@ Text_t compile_enum_header(env_t *env, ast_t *ast) {
 
     if (!has_any_tags_with_fields) {
         Text_t enum_def = Texts("enum ", enum_name, " ", enum_tags, ";\n");
-        Text_t info = namespace_name(env, env->namespace, Texts(def->name, "$$info"));
+        Text_t info = namespace_name(env, env->namespace, Texts(name, "$$info"));
         return Texts(enum_def, "extern const TypeInfo_t ", info, ";\n");
     }
 
-    Text_t struct_name = namespace_name(env, env->namespace, Texts(def->name, "$$struct"));
+    Text_t struct_name = namespace_name(env, env->namespace, Texts(name, "$$struct"));
     Text_t enum_def = Texts("struct ", struct_name,
                             " {\n"
                             "enum ",
                             enum_tags,
                             " $tag;\n"
                             "union {\n");
-    for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
+    for (tag_ast_t *tag = tags; tag; tag = tag->next) {
         if (!tag->fields) continue;
-        Text_t field_def = compile_struct_header(
-            env,
-            WrapAST(ast, StructDef, .name = Text$as_c_string(Texts(def->name, "$", tag->name)), .fields = tag->fields));
+        Text_t field_def = compile_struct_header(env, NewAST(tag->file, tag->start, tag->end, StructDef,
+                                                             .name = Text$as_c_string(Texts(name, "$", tag->name)),
+                                                             .fields = tag->fields));
         all_defs = Texts(all_defs, field_def);
-        Text_t tag_type = namespace_name(env, env->namespace, Texts(def->name, "$", tag->name, "$$type"));
+        Text_t tag_type = namespace_name(env, env->namespace, Texts(name, "$", tag->name, "$$type"));
         enum_def = Texts(enum_def, tag_type, " ", valid_c_name(tag->name), ";\n");
     }
     enum_def = Texts(enum_def, "};\n};\n");
     all_defs = Texts(all_defs, enum_def);
 
-    Text_t info = namespace_name(env, env->namespace, Texts(def->name, "$$info"));
+    Text_t info = namespace_name(env, env->namespace, Texts(name, "$$info"));
     all_defs = Texts(all_defs, "extern const TypeInfo_t ", info, ";\n");
-    for (tag_ast_t *tag = def->tags; tag; tag = tag->next) {
+    for (tag_ast_t *tag = tags; tag; tag = tag->next) {
         if (!tag->fields) continue;
 
         Text_t arg_sig = EMPTY_TEXT;
@@ -129,8 +125,8 @@ Text_t compile_enum_header(env_t *env, ast_t *ast) {
             if (field->next) arg_sig = Texts(arg_sig, ", ");
         }
         if (arg_sig.length == 0) arg_sig = Text("void");
-        Text_t enum_type = namespace_name(env, env->namespace, Texts(def->name, "$$type"));
-        Text_t tagged_name = namespace_name(env, env->namespace, Texts(def->name, "$tagged$", tag->name));
+        Text_t enum_type = namespace_name(env, env->namespace, Texts(name, "$$type"));
+        Text_t tagged_name = namespace_name(env, env->namespace, Texts(name, "$tagged$", tag->name));
         Text_t constructor_def = Texts(enum_type, " ", tagged_name, "(", arg_sig, ");\n");
         all_defs = Texts(all_defs, constructor_def);
     }
diff --git a/src/compile/enums.h b/src/compile/enums.h
index 888fc294..9fadb345 100644
--- a/src/compile/enums.h
+++ b/src/compile/enums.h
@@ -8,7 +8,7 @@
 #include "../types.h"
 
 Text_t compile_empty_enum(type_t *t);
-Text_t compile_enum_constructors(env_t *env, ast_t *ast);
+Text_t compile_enum_constructors(env_t *env, const char *name, tag_ast_t *tags);
 Text_t compile_enum_field_access(env_t *env, ast_t *ast);
-Text_t compile_enum_header(env_t *env, ast_t *ast);
-Text_t compile_enum_typeinfo(env_t *env, ast_t *ast);
+Text_t compile_enum_header(env_t *env, const char *name, tag_ast_t *tags);
+Text_t compile_enum_typeinfo(env_t *env, const char *name, tag_ast_t *tags);
diff --git a/src/compile/files.c b/src/compile/files.c
index 4d6fb1a8..7ff252c2 100644
--- a/src/compile/files.c
+++ b/src/compile/files.c
@@ -125,8 +125,8 @@ Text_t compile_top_level_code(env_t *env, ast_t *ast) {
     }
     case EnumDef: {
         DeclareMatch(def, ast, EnumDef);
-        Text_t code = compile_enum_typeinfo(env, ast);
-        code = Texts(code, compile_enum_constructors(env, ast));
+        Text_t code = compile_enum_typeinfo(env, def->name, def->tags);
+        code = Texts(code, compile_enum_constructors(env, def->name, def->tags));
         return Texts(code, compile_namespace(env, def->name, def->namespace));
     }
     case LangDef: {
@@ -162,9 +162,30 @@ Text_t compile_top_level_code(env_t *env, ast_t *ast) {
     }
 }
 
+typedef struct {
+    env_t *env;
+    Text_t *code;
+} compile_info_t;
+
+static void add_type_infos(type_ast_t *type_ast, void *userdata) {
+    if (type_ast && type_ast->tag == EnumTypeAST) {
+        compile_info_t *info = (compile_info_t *)userdata;
+        *info->code = Texts(
+            *info->code,
+            compile_enum_typeinfo(info->env, String("enum$", (int64_t)(type_ast->start - type_ast->file->text)),
+                                  Match(type_ast, EnumTypeAST)->tags),
+            compile_enum_constructors(info->env, String("enum$", (int64_t)(type_ast->start - type_ast->file->text)),
+                                      Match(type_ast, EnumTypeAST)->tags));
+    }
+}
+
 public
 Text_t compile_file(env_t *env, ast_t *ast) {
     Text_t top_level_code = compile_top_level_code(env, ast);
+
+    compile_info_t info = {.env = env, .code = &top_level_code};
+    type_ast_visit(ast, add_type_infos, &info);
+
     Text_t includes = EMPTY_TEXT;
     Text_t use_imports = EMPTY_TEXT;
 
diff --git a/src/compile/headers.c b/src/compile/headers.c
index 33a979cf..77040445 100644
--- a/src/compile/headers.c
+++ b/src/compile/headers.c
@@ -146,6 +146,41 @@ static void _define_types_and_funcs(compile_typedef_info_t *info, ast_t *ast) {
                           compile_statement_namespace_header(info->env, info->header_path, ast));
 }
 
+static void add_type_headers(type_ast_t *type_ast, void *userdata) {
+    if (!type_ast) return;
+
+    if (type_ast->tag == EnumTypeAST) {
+        compile_typedef_info_t *info = (compile_typedef_info_t *)userdata;
+        DeclareMatch(enum_, type_ast, EnumTypeAST);
+        bool has_any_tags_with_fields = false;
+        for (tag_ast_t *tag = enum_->tags; tag; tag = tag->next) {
+            has_any_tags_with_fields = has_any_tags_with_fields || (tag->fields != NULL);
+        }
+
+        const char *name = String("enum$", (int64_t)(type_ast->start - type_ast->file->text));
+        if (has_any_tags_with_fields) {
+            Text_t struct_name = namespace_name(info->env, info->env->namespace, Texts(name, "$$struct"));
+            Text_t type_name = namespace_name(info->env, info->env->namespace, Texts(name, "$$type"));
+            *info->header = Texts(*info->header, "typedef struct ", struct_name, " ", type_name, ";\n");
+
+            for (tag_ast_t *tag = enum_->tags; tag; tag = tag->next) {
+                if (!tag->fields) continue;
+                Text_t tag_struct =
+                    namespace_name(info->env, info->env->namespace, Texts(name, "$", tag->name, "$$struct"));
+                Text_t tag_type =
+                    namespace_name(info->env, info->env->namespace, Texts(name, "$", tag->name, "$$type"));
+                *info->header = Texts(*info->header, "typedef struct ", tag_struct, " ", tag_type, ";\n");
+            }
+        } else {
+            Text_t enum_name = namespace_name(info->env, info->env->namespace, Texts(name, "$$enum"));
+            Text_t type_name = namespace_name(info->env, info->env->namespace, Texts(name, "$$type"));
+            *info->header = Texts(*info->header, "typedef enum ", enum_name, " ", type_name, ";\n");
+        }
+
+        *info->header = Texts(*info->header, compile_enum_header(info->env, name, enum_->tags));
+    }
+}
+
 public
 Text_t compile_file_header(env_t *env, Path_t header_path, ast_t *ast) {
     Text_t header =
@@ -155,6 +190,9 @@ Text_t compile_file_header(env_t *env, Path_t header_path, ast_t *ast) {
 
     compile_typedef_info_t info = {.env = env, .header = &header, .header_path = header_path};
     visit_topologically(Match(ast, Block)->statements, (Closure_t){.fn = (void *)_make_typedefs, &info});
+
+    type_ast_visit(ast, add_type_headers, &info);
+
     visit_topologically(Match(ast, Block)->statements, (Closure_t){.fn = (void *)_define_types_and_funcs, &info});
 
     header = Texts(header, "void ", namespace_name(env, env->namespace, Text("$initialize")), "(void);\n");
@@ -211,7 +249,8 @@ Text_t compile_statement_type_header(env_t *env, Path_t header_path, ast_t *ast)
         return compile_struct_header(env, ast);
     }
     case EnumDef: {
-        return compile_enum_header(env, ast);
+        DeclareMatch(def, ast, EnumDef);
+        return compile_enum_header(env, def->name, def->tags);
     }
     case LangDef: {
         DeclareMatch(def, ast, LangDef);
diff --git a/src/parse/typedefs.c b/src/parse/typedefs.c
index 6e5e40d0..50562536 100644
--- a/src/parse/typedefs.c
+++ b/src/parse/typedefs.c
@@ -134,8 +134,8 @@ ast_t *parse_enum_def(parse_ctx_t *ctx, const char *pos) {
             fields = NULL;
         }
 
-        tags = new (tag_ast_t, .start = tag_start, .end = pos, .name = tag_name, .fields = fields, .secret = secret,
-                    .next = tags);
+        tags = new (tag_ast_t, .file = ctx->file, .start = tag_start, .end = pos, .name = tag_name, .fields = fields,
+                    .secret = secret, .next = tags);
 
         if (!match_separator(ctx, &pos)) break;
     }
diff --git a/src/parse/types.c b/src/parse/types.c
index 683e51ce..d87fc628 100644
--- a/src/parse/types.c
+++ b/src/parse/types.c
@@ -124,8 +124,8 @@ type_ast_t *parse_enum_type(parse_ctx_t *ctx, const char *pos) {
             fields = NULL;
         }
 
-        tags = new (tag_ast_t, .start = tag_start, .end = pos, .name = tag_name, .fields = fields, .secret = secret,
-                    .next = tags);
+        tags = new (tag_ast_t, .file = ctx->file, .start = tag_start, .end = pos, .name = tag_name, .fields = fields,
+                    .secret = secret, .next = tags);
 
         if (!match_separator(ctx, &pos)) break;
     }
diff --git a/src/typecheck.c b/src/typecheck.c
index 86876c30..806cf1bf 100644
--- a/src/typecheck.c
+++ b/src/typecheck.c
@@ -146,7 +146,7 @@ type_t *parse_type_ast(env_t *env, type_ast_t *ast) {
                               .next = fields);
             }
             REVERSE_LIST(fields);
-            const char *struct_name = String(enum_name, "$$", tag_ast->name);
+            const char *struct_name = String(enum_name, "$", tag_ast->name);
             env_t *struct_env = namespace_env(env, struct_name);
             type_t *tag_type = Type(StructType, .name = tag_ast->name, .fields = fields, .env = struct_env);
             tags = new (tag_t, .name = tag_ast->name, .tag_value = tag_value, .type = tag_type, .next = tags);