keep args as objs inside of CallObj instead of exps

Author: aduarterengifo

src/services/diff/obj.ts

@@ -36,11 +36,17 @@ const baseBuiltInDiffFunc =
 					Effect.flatMap((diffFn) =>
 						Match.value(diffFn).pipe(
 							Match.when("sin", () =>
-								Effect.succeed(
-									CallObj.make({
-										fn: BuiltInObj.make({ fn: "cos" }),
-										args,
-									}),
+								Schema.decodeUnknown(PolynomialObj)(args[0]).pipe(
+									Effect.flatMap((g) =>
+										chainRule(
+											CallObj.make({
+												fn: BuiltInObj.make({ fn: "cos" }),
+												args,
+											}),
+											g,
+											x,
+										),
+									),
 								),
 							),
 							Match.when("cos", () =>

src/services/evaluator/index.ts

@@ -18,7 +18,6 @@ import type { Obj } from "@/schemas/objs/union";
 import { PolynomialObj } from "@/schemas/objs/unions/polynomials";
 import { fnTokenSchema } from "@/schemas/token/function-literal";
 import { Effect, Either, Match, Schema } from "effect";
-import { left } from "effect/Either";
 import type { ParseError } from "effect/ParseResult";
 import type { KennethParseError } from "src/errors/kenneth/parse";
 import type { DiffExp } from "src/schemas/nodes/exps/diff";
@@ -138,7 +137,9 @@ const nodeEvalMatch = (env: Environment) =>
 									Schema.decodeUnknownEither(BuiltInDiffObj)(fnEval);
 
 								return yield* Either.isRight(either) && identoverlap
-									? Effect.succeed(CallObj.make({ fn: either.right, args }))
+									? Effect.succeed(
+											CallObj.make({ fn: either.right, args: argsEval }),
+										)
 									: applyFunction(obj)(argsEval);
 							}),
 						),