8000 Analyzer recovery: unhelpful errors caused by extra < in type parameters · Issue #43141 · dart-lang/sdk · GitHub
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Analyzer recovery: unhelpful errors caused by extra < in type parameters #43141

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whesse opened this issue Aug 21, 2020 · 0 comments
Open

Analyzer recovery: unhelpful errors caused by extra < in type parameters #43141

whesse opened this issue Aug 21, 2020 · 0 comments
Labels
analyzer-recovery legacy-area-front-end Legacy: Use area-dart-model instead. model-error-recovery Error recovery in analyzer/CFE. P3 A lower priority bug or feature request

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@whesse
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whesse commented Aug 21, 2020 •
edited by devoncarew
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The error messages generated by this code with an extra < are not very helpful, and appear on lines
much earlier than the error occurs at. The analyzer thinks a field called "Map" is being added to the class.
And the error messages for the error location don't indicate anything about type parameters or <.
Could recovery do a better job by not incorrectly adding this field?
These messages appear on Dart stable 2.9 and dev 2.10.0-45.0.dev

The code is:

class QueryResults extends ChangeNotifier {
  Filter filter;
  final foo = {1:2};
  Map<int, int> bar = {1:2};
  bool showAll = true;
  List<String> names = [];
  Map<String, <Map<String, int>>> counts = {};  // ERROR: extra < before Map.
  Map<String, Map<ChangeInResult, List<Result>>> grouped = {};
  bool partialResults = true;
}

The error messages are:

error: The instance member 'Map' can't be accessed in an initializer. (implicit_this_reference_in_initializer at [flutter_current_results_a] lib/query.dart:18)
error: Map isn't a type. (not_a_type at [flutter_current_results_a] lib/query.dart:18)
error: A function body must be provided. (missing_function_body at [flutter_current_results_a] lib/query.dart:21)
error: Expected an identifier. (missing_identifier at [flutter_current_results_a] lib/query.dart:21)
error: Variables must be declared using the keywords 'const', 'final', 'var' or a type name. (missing_const_final_var_or_type at [flutter_current_results_a] lib/query.dart:21)
error: Methods must have an explicit list of parameters. (missing_method_parameters at [flutter_current_results_a] lib/query.dart:21)
error: The instance member 'Map' can't be accessed in an initializer. (implicit_this_reference_in_initializer at [flutter_current_results_a] lib/query.dart:22)
error: Map isn't a type. (not_a_type at [flutter_current_results_a] lib/query.dart:22)
@whesse whesse added P3 A lower priority bug or feature request analyzer-recovery labels Aug 21, 2020
@devoncarew devoncarew added legacy-area-front-end Legacy: Use area-dart-model instead. front-end-fasta-recovery labels Aug 24, 2020
@johnniwinther johnniwinther added model-error-recovery Error recovery in analyzer/CFE. and removed front-end-fasta-recovery labels Apr 1, 2025
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analyzer-recovery legacy-area-front-end Legacy: Use area-dart-model instead. model-error-recovery Error recovery in analyzer/CFE. P3 A lower priority bug or feature request
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