fix: random fixes

src/parser/grammar.c

@@ -166,5 +166,30 @@ bool is_first(struct token token, enum rule rule)
 
 struct ast *parse_input(struct lexer_context *ctx)
 {
-    return parse_list(ctx);
+    struct token *token = PEEK_TOKEN();
+
+    if (token->type == TOKEN_EOF)
+        return ast_create_list(NULL);
+
+    if (token->type == TOKEN_NEWLINE)
+    {
+        POP_TOKEN();
+        return ast_create_list(NULL);
+    }
+
+    struct ast *ast = parse_list(ctx);
+    if (ast == NULL)
+        return NULL;
+
+    token = PEEK_TOKEN();
+    if (token->type == TOKEN_NEWLINE || token->type == TOKEN_EOF)
+    {
+        if (token->type == TOKEN_NEWLINE)
+            POP_TOKEN();
+        return ast;
+    }
+
+    puts("Syntax error: expected newline or EOF after list");
+    ast_free(&ast);
+    return NULL;
 }