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It looks like collection expressions make unnecessary copies of structures which could be big.
Area-Compilers
Bug
Code Gen Quality
Room for improvement in the quality of the compiler's generated code
New Feature - Collection Expressions
Handling of infinite collection initialization chains could be unified
Area-Compilers
Concept-Design Debt
Engineering Debt, Design Debt, or poor product code quality
New Feature - Collection Expressions
New Feature - ParamsCollections
untriaged
Issues and PRs which have not yet been triaged by a lead
Collection expressions: nullable analysis of spread element expression
Area-Compilers
New Feature - Collection Expressions
untriaged
Issues and PRs which have not yet been triaged by a lead
VSCode
Custom modifiers are not copied in array type collection expression lowering
Area-Compilers
Bug
New Feature - Collection Expressions
untriaged
Issues and PRs which have not yet been triaged by a lead
Inlining collection expression local into a spread could inline more aggressively
Area-IDE
help wanted
The issue is "up for grabs" - add a comment if you are interested in working on it
New Feature - Collection Expressions
Generalize Room for improvement in the quality of the compiler's generated code
help wanted
The issue is "up for grabs" - add a comment if you are interested in working on it
New Feature - Collection Expressions
(CollectionBuilderType<T>)[..readOnlySpan]
optimization to spread operands which are implicitly convertible to ReadOnlySpan<T>
Area-Compilers
Code Gen Quality
GetCollectionExpressionConversion should accumulate and propagate dependencies from HasCollectionExpressionApplicableAddMethod in the success case
Area-Compilers
New Feature - Collection Expressions
untriaged
Issues and PRs which have not yet been triaged by a lead
Compiler could generate better IL for collection expressions
Area-Compilers
Code Gen Quality
Room for improvement in the quality of the compiler's generated code
help wanted
The issue is "up for grabs" - add a comment if you are interested in working on it
New Feature - Collection Expressions
Add code fix for CS9176: There is no target type for the collection literal.
Area-IDE
Feature Request
Need Design Review
The end user experience design needs to be reviewed and approved.
New Feature - Collection Expressions
Formatting fixer doesn't fix formatting diagnostic
Area-IDE
Bug
help wanted
The issue is "up for grabs" - add a comment if you are interested in working on it
New Feature - Collection Expressions
Imperfect IEnumerable<T> -> Span<T> collection expression conversion
Area-Compilers
Code Gen Quality
Room for improvement in the quality of the compiler's generated code
New Feature - Collection Expressions
Poor codegen for collection expression spread (IEnumerable<T> -> ImmutableArray<T>)
Area-Compilers
Code Gen Quality
Room for improvement in the quality of the compiler's generated code
help wanted
The issue is "up for grabs" - add a comment if you are interested in working on it
New Feature - Collection Expressions
Rationalize spread optimization targeting List when collection-expr contains spread values of ICollection type
Area-Compilers
Code Gen Quality
Room for improvement in the quality of the compiler's generated code
New Feature - Collection Expressions
Store the dest collection as span to a temp for CopyTo optimization
Area-Compilers
Code Gen Quality
Room for improvement in the quality of the compiler's generated code
New Feature - Collection Expressions
Code fix for IDE0028 produces invalid collection expression
Area-IDE
New Feature - Collection Expressions
Resolution-By Design
The behavior reported in the issue matches the current design
Consider preferring AddRange over CopyTo for collection-expressions of List type
Area-Compilers
Code Gen Quality
Room for improvement in the quality of the compiler's generated code
New Feature - Collection Expressions
Collection expressions: use constant indices when populating the span for a List<T>
Area-Compilers
Bug
help wanted
The issue is "up for grabs" - add a comment if you are interested in working on it
New Feature - Collection Expressions
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