comp_ctx: remove Environment in favor of UnderlyingTypeMap

examples/hello.ry

@@ -7,7 +7,7 @@ fn f() i32 {
     return 2;
 }
 
-fn f2() i64 {
+fn f2() i32 {
     return 1301;
 }
 
@@ -48,3 +48,7 @@ fn and_fn() bool {
 //    print("piss\n");
 //    // print("2 + 2 = %d\n", add(1, 2));
 //}
+
+fn _start() i32 {
+    return 0;
+}

src/comp_ctx.zig

@@ -31,11 +31,10 @@ 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: Environment,
+    env: UnderlyingTypeMap,
 
     /// Used for debug information.
     children: ScopeList,
@@ -48,7 +47,7 @@ pub const Scope = struct {
 
         scope.* = Scope{
             .parent = parent,
-            .env = Environment.init(allocator),
+            .env = UnderlyingTypeMap.init(allocator),
             .children = ScopeList.init(allocator),
             .allocator = allocator,
             .id = id,