diff --git a/examples/hello.ry b/examples/hello.ry
index 482c1f7..4c0dad8 100644
--- a/examples/hello.ry
+++ b/examples/hello.ry
@@ -7,7 +7,7 @@ fn f() i32 {
     return 2;
 }
 
-fn f2() i32 {
+fn f2() i64 {
     return 1301;
 }
 
diff --git a/src/comp_ctx.zig b/src/comp_ctx.zig
index 0a407e3..ac1cfa8 100644
--- a/src/comp_ctx.zig
+++ b/src/comp_ctx.zig
@@ -31,10 +31,11 @@ pub const SymbolUnderlyingType = union(SymbolUnderlyingTypeEnum) {
     Enum: []const u8,
 };
 
+pub const Environment = std.StringHashMap(SymbolUnderlyingType);
 pub const ScopeList = std.ArrayList(*Scope);
 pub const Scope = struct {
     parent: ?*Scope,
-    env: UnderlyingTypeMap,
+    env: Environment,
 
     /// Used for debug information.
     children: ScopeList,
@@ -47,7 +48,7 @@ pub const Scope = struct {
 
         scope.* = Scope{
             .parent = parent,
-            .env = UnderlyingTypeMap.init(allocator),
+            .env = Environment.init(allocator),
             .children = ScopeList.init(allocator),
             .allocator = allocator,
             .id = id,