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bad warning for LinkedHashMap constructor (prefer_collection_literals) #58565

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keithshep opened this issue Nov 4, 2021 · 2 comments
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bad warning for LinkedHashMap constructor (prefer_collection_literals) #58565

keithshep opened this issue Nov 4, 2021 · 2 comments
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@srawlins
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analyzer-linter Issues with the analyzer's support for the linter package area-analyzer Use area-analyzer for Dart analyzer issues, including the analysis server and code completion. linter-false-positive linter-set-recommended P2 A bug or feature request we're likely to work on

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@keithshep
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Describe the issue

The linter gives a bad warning for LinkedHashMap constructor: "Use collection literals when possible."

To Reproduce

void testLinkedHashMap() {
  final LinkedHashMap<String, String> x;
  x = LinkedHashMap<String, String>();
  print(x.length);
}

if the suggestion is followed to convert to a literal invalid code is generated: x = <String, String>{};

Expected behavior

No such warning for LinkedHashMap()
@pq
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pq commented Nov 4, 2021

Thanks for the report and repro @keithshep !

@jamesderlin
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Duplicate of #57993.

@pq pq added the P2 A bug or feature request we're likely to work on label Nov 14, 2022
@srawlins srawlins self-assigned this Aug 31, 2023
copybara-service bot referenced this issue Sep 1, 2023
@srawlins
linter: Refactor prefer_collection_literals to use context type more
cd8a337 
There is a basic premise in this rule which we cannot satisfy exactly:
we need to disallow `LinkedHashSet()` unless the context type requires
the developer to use `LinkedHashSet`. But the context type is long
gone when the lint rule is run.

This CL adds some logic to try to attempt figuring out the context
type in the cases where users have filed bugs, but it will never be
super accurate.

Fixes https://github.com/dart-lang/linter/issues/4736
Fixes https://github.com/dart-lang/linter/issues/3057
Fixes https://github.com/dart-lang/linter/issues/1649
Fixes https://github.com/dart-lang/linter/issues/2795

Change-Id: I3e6c6de81084dca2825488c89830ab3e7ea63186
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/323680
Reviewed-by: Phil Quitslund <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
Commit-Queue: Samuel Rawlins <[email protected]>
copybara-service bot referenced this issue Sep 4, 2023
Revert "linter: Refactor prefer_collection_literals to use context ty…
cbdae14 
…pe more"

This reverts commit cd8a337.

Reason for revert: lint starts barking at the wrong tree: b/298917960

Original change's description:
> linter: Refactor prefer_collection_literals to use context type more
>
> There is a basic premise in this rule which we cannot satisfy exactly:
> we need to disallow `LinkedHashSet()` unless the context type requires
> the developer to use `LinkedHashSet`. But the context type is long
> gone when the lint rule is run.
>
> This CL adds some logic to try to attempt figuring out the context
> type in the cases where users have filed bugs, but it will never be
> super accurate.
>
> Fixes https://github.com/dart-lang/linter/issues/4736
> Fixes https://github.com/dart-lang/linter/issues/3057
> Fixes https://github.com/dart-lang/linter/issues/1649
> Fixes https://github.com/dart-lang/linter/issues/2795
>
> Change-Id: I3e6c6de81084dca2825488c89830ab3e7ea63186
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/323680
> Reviewed-by: Phil Quitslund <[email protected]>
> Reviewed-by: Konstantin Shcheglov <[email protected]>
> Commit-Queue: Samuel Rawlins <[email protected]>

Change-Id: I980053dd51ffd4447721e0ad7436b07ca704b554
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/324021
Bot-Commit: Rubber Stamper <[email protected]>
Reviewed-by: Alexander Thomas <[email protected]>
Commit-Queue: Ilya Yanok <[email protected]>
copybara-service bot referenced this issue Sep 5, 2023
@srawlins
Revert "Revert "linter: Refactor prefer_collection_literals to use co…
4bddf8a 
…ntext type more""

This reverts commit cbdae14.

In addition, Fix prefer_collection_literals for methods with expression bodies

Original description:

linter: Refactor prefer_collection_literals to use context type more

There is a basic premise in this rule which we cannot satisfy exactly:
we need to disallow `LinkedHashSet()` unless the context type requires
the developer to use `LinkedHashSet`. But the context type is long
gone when the lint rule is run.

This CL adds some logic to try to attempt figuring out the context
type in the cases where users have filed bugs, but it will never be
super accurate.

Fixes https://github.com/dart-lang/linter/issues/4736
Fixes https://github.com/dart-lang/linter/issues/3057
Fixes https://github.com/dart-lang/linter/issues/1649
Fixes https://github.com/dart-lang/linter/issues/2795

Change-Id: I958ba69a56866c18523ce6cbf62645ef8e028f6b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/324260
Commit-Queue: Samuel Rawlins <[email protected]>
Reviewed-by: Konstantin Shcheglov <[email protected]>
@devoncarew devoncarew added analyzer-linter Issues with the analyzer's support for the linter package area-analyzer Use area-analyzer for Dart analyzer issues, including the analysis server and code completion. labels Nov 19, 2024
@devoncarew devoncarew transferred this issue from dart-lang/linter Nov 19, 2024
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@srawlins srawlins

Labels
analyzer-linter Issues with the analyzer's support for the linter package area-analyzer Use area-analyzer for Dart analyzer issues, including the analysis server and code completion. linter-false-positive linter-set-recommended P2 A bug or feature request we're likely to work on
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@pq @srawlins @keithshep @devoncarew @jamesderlin