Dart 3.2 requirement.

analysis_options.yaml

@@ -13,8 +13,6 @@ linter:
     - camel_case_types
     - combinators_ordering
     - comment_references
-    - dangling_library_doc_comments
-    - implicit_call_tearoffs
     - invalid_case_patterns
     - no_self_assignments
     - no_wildcard_variable_uses
@@ -24,29 +22,15 @@ linter:
     - prefer_const_declarations
     - prefer_const_literals_to_create_immutables
     - prefer_expression_function_bodies
-    - prefer_final_fields
     - prefer_final_in_for_each
     - prefer_final_locals
-    - prefer_for_elements_to_map_fromIterable
-    - prefer_function_declarations_over_variables
     - prefer_if_elements_to_conditional_expressions
     - prefer_relative_imports
-    - type_literal_in_constant_pattern
     - unnecessary_await_in_return
-    - unnecessary_brace_in_string_interps
     - unnecessary_breaks
-    - unnecessary_const
-    - unnecessary_constructor_name
-    - unnecessary_getters_setters
     # - unnecessary_lambdas
-    - unnecessary_late
-    - unnecessary_new
-    - unnecessary_null_aware_assignments
     - unnecessary_null_aware_operator_on_extension_on_nullable
     - unnecessary_null_checks
-    - unnecessary_null_in_if_null_operators
     - unnecessary_parenthesis
     - unnecessary_statements
-    - unnecessary_to_list_in_spreads
-    - unreachable_from_main
-    - use_super_parameters
+    - unreachable_from_main

lib/src/lisp/environment.dart

@@ -19,7 +19,7 @@ class Environment {
     if (_bindings.containsKey(key)) {
       return _bindings[key];
     } else if (_owner != null) {
-      return _owner![key];
+      return _owner[key];
     } else {
       _invalidBinding(key);
       return null;
@@ -31,7 +31,7 @@ class Environment {
     if (_bindings.containsKey(key)) {
       _bindings[key] = value;
     } else if (_owner != null) {
-      _owner![key] = value;
+      _owner[key] = value;
     } else {
       _invalidBinding(key);
     }

pubspec.yaml

@@ -13,7 +13,7 @@ topics:
   - peg
 
 environment:
-  sdk: ^3.0.0
+  sdk: ^3.2.0
 dependencies:
   collection: ^1.18.0
   data: ^0.12.0
@@ -25,7 +25,7 @@ dependencies:
 dev_dependencies:
   build_runner: ^2.4.0
   build_web_compilers: ^4.0.0
-  lints: ^2.1.0
+  lints: ^3.0.0
   test: ^1.24.0
 dependency_overrides:
   xml: