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Paul Berry eec56c088e [flow analysis] Mark false branches of trivial is tests unreachable. 
When an `is` test is trivially satisfied (i.e. `expr is T`, when the
static type of `expr` is a subtype of `T`), the `is` test is
guaranteed by soundness to evaluate to `true`, so any code path that
follows from the `is` test evaluating to `false` is unreachable.

This reasoning wasn't valid prior to sound null safety, because in
mixed mode programs, it was possible for an expression to evaluate to
`null` even if its static type wasn't nullable, and hence `expr is T`
might evaluate to `false` even if the static type of `expr` was a
subtype of `T`. So this change is gated on the `sound-flow-analysis`
language flag (which is enabled in Dart 3.9).

Fixes https://github.com/dart-lang/sdk/issues/60718.

Change-Id: I66a65580b738162f23b6fb468b71fcac66bfbb95
Bug: https://github.com/dart-lang/sdk/issues/60718
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/431740
Commit-Queue: Paul Berry <paulberry@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
2025-06-04 05:17:21 -07:00
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abstract
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accessor_conflict
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argument
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assert
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assign
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async
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async_nested
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async_star
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augmentation_libraries
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await
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bool
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call
[tests] Add regression test for dartbug.com/60643
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canonicalize
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cascade
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class
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class_modifiers
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closure
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compile_time_constant
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const
[model] Remove more nullability-related assignability error messages
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const_functions
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constants_2018
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constructor
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control_flow_collections
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covariant
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covariant_override
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deferred
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dot_shorthands
[analyzer] Dot shorthands: Infer type parameters in constructor tearoffs.
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double
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double_literals
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dynamic
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enum
[cfe] Combine getter/setter and final field/setter into one property builder
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exception
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export
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extension_methods
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extension_type
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external_abstract_fields
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factory
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field
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final
[cfe] Add LookupResult
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function
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function_subtype
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function_type
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generic
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generic_methods
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getter
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identifier
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identity
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if
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if_null
[model] Remove more nullability-related assignability error messages
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implicit_creation
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implicit_downcast_during
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import
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inference
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inference_update_1
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inference_update_2
[flow analysis] Allow non-cascaded field accesses to participate in field promotion.
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inference_update_3
Reformat tests/language/f-l using the 3.8 style.
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inference_update_4
[flow][tests] Language tests for issue 1721 - allow better promotions for final vars.
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inference_using_bounds
Retired inference-using-bounds and wildcard-variables experiments.
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initializing_formal
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instance
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instantiate_to_bound
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interceptor
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interface
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invalid_returns
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is
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label
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lazy
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least_upper_bound
[flow analysis] Do not promote to mutual subtypes.
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library
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list
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loop
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main
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malbounded
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malformed
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map
[model] Remove more nullability-related assignability error messages
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metadata
[cfe] Add LookupResult
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method
[cfe] Add LookupResult
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mixin
[ddc] Adding support for hot reloaded super getters.
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mixin_constructor_forwarding
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mixin_declaration
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mixin_legacy
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named_arguments_anywhere
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new
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nnbd
[test_runner] Remove nnbd mode options.
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no_such_method
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nonfunction_type_aliases
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nosuchmethod_forwarding
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null
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null_aware
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null_aware_elements
[model] Remove more nullability-related assignability error messages
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number
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operator
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optimize
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override
Enable 'getter-setter-error' flag in 3.9
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parameter
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part
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patterns
[model] Remove more nullability-related assignability error messages
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prefix
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private
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propagate
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records
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redirecting
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reg_exp
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regress
[vm,dyn_modules] Convert function type args to instance type args when allocating an object in constructor tear-off
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resolution
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return
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rewrite
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scaling
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script
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sealed_class
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set_literals
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setter
Enable 'getter-setter-error' flag in 3.9
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sound_flow_analysis
[flow analysis] Mark false branches of trivial is tests unreachable.
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spread_collections
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stack_trace
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static
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string
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subtyping_static
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super
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superinterface_variance
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switch
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symbol
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sync_star
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syntax
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test_runner
[cfe] Remove tests using import augment
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this
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top_level
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type
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type_object
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type_promotion
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type_variable
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typedef
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unsorted
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value_class
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variable
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variance
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vm
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void
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why_not_promoted
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wildcard_variables
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await_type_error_test.dart
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await_type_test.dart
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covariant_field_implicit_setter_test.dart
[dart2wasm] Fix missing type check in implicit field setters if field is covariant
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dynamic_type_helper.dart
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explicit_type_instantiation_parsing_test.dart
[analyzer] Dot shorthands: Error - unable to resolve a dot shorthand property access.
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flutter_regession_151473_test.dart
[dart2wasm] Disentagle dispatch table calls from static calls in dart2wasm
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language_analyzer.status
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language_dart2js.status
[status_files] Cleanup status files
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language_dart2wasm.status
[dart2wasm] Add deferred loading support to dart2wasm (11/X).
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language_dartdevc.status
Reland "[ddc] Clean up old async logic in ddc compiler."
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language_kernel.status
[test] Unskip many tests in reload stress testing.
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language_precompiled.status
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language_spec_parser.status
Adjust tests and spec_parser to updated grammar
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language_vm.status
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language.status
[vm, dynamic_modules] Handle native stack overflow in the interpreter
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library1.dart
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library2.dart
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library10.dart
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library11.dart
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library12.dart
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OWNERS
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record_literal_problems_test.dart
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record_literal_test.dart
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record_type_empty_problems_test.dart
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record_type_problems_test.dart
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record_type_test.dart
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regress_54994_test.dart
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regression_55741_test.dart
[dart2wasm] Only share type parameter fields if nullability allows
2024-05-17 12:07:56 +00:00
regression_56129_test.dart
[dart2wasm] Fix bug in handling of optional arguments
2024-07-05 07:38:49 +00:00
static_type_helper.dart
Collect all test-related files in package:expect.
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static_weak_reference_error_test.dart
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static_weak_reference_function_apply_test.dart
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static_weak_reference_test.dart
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syntax_helper.dart
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