[Version 12.0] Feature support for using alias types - #1622
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Source: #1622 PR head SHA: 2c757c3 Merge-base SHA: 2ab4487 Aggregate diff SHA-256: 91f612e09b913bb919438fad609b84472810f8cd74de6271d517cf0a34e435ca Applied: cleanly (no conflicts) Status: REVIEW_REQUIRED — not ECMA-approved; alpha-v12 working draft only Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 7c07b608-2471-41d5-845a-152b2378a43d
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Ran StandardAnchorTags (tools/StandardAnchorTags/) against alpha-v12 after applying six C# 12 feature patches (PRs #1766, #1638, #1620, #1624, #1623, #1622). Three operations performed: Section renumber and cross-reference update (StandardAnchorTags phases 1–2): Resolved all 12 symbolic §-anchor headings introduced by the feature patches to real section numbers in document order: §struct-prim-constructors → §16.4 (structs.md) §InlineArray → §16.6 (structs.md) §declaring-a-collection-type → §15.17 (classes.md) §declaring-a-collection-type-general → §15.17.1 §collection-construction → §15.17.2 §prim-constructor → §15.11.6 (classes.md) §InlineArrayElementAccess → §12.8.12.3 (expressions.md) §collection-expressions → §12.8.25 (expressions.md) §imp-collection-expression-conv → §10.2.22 (conversions.md) §ImplicitInlineArrayConversions → §10.2.23 (conversions.md) §collection-builder-attr → §23.5.12 (attributes.md) §InlineArrayAttribute → §23.5.13 (attributes.md) Existing sections displaced by new insertions were renumbered: structs.md: §16.4 Record structs → §16.5; §16.5 → §16.7; §16.6 → §16.8 (cascade: §16.6.15 safe-context-constraint → §16.8.15 throughout) classes.md: §15.17 Record class differences → §15.18 expressions.md: §12.8.12.3 String access → §12.8.12.4; §12.8.12.4 Indexer access → §12.8.12.5 All cross-references to displaced sections updated in: arrays.md, attributes.md, classes.md, conversions.md, expressions.md, interfaces.md, namespaces.md, ranges.md, structs.md, types.md, unsafe-code.md, variables.md. README TOC update (WriteUpdatedTOC): standard/README.md regenerated to reflect new section numbers and entries for all six C# 12 features. New TOC entries include §15.17 Declaring a collection type, §16.4 Primary constructors, §16.6 Inline arrays, §10.2.22–§10.2.23, §12.8.12.3, §23.5.12–§23.5.13. Grammar regeneration (GenerateNewGrammar): standard/grammar.md regenerated from grammar blocks embedded in all standard/*.md files. C# 12 grammar additions from the six feature deltas now present: - collection_expression / collection_element / expression_element / spread_element (PR #1638, §12.8.25) - non_record_class_with_positional_members with delimited_parameter_list (PR #1766); non_record_class_without_positional_members split out - non_record_struct_with/without_positional_members (PR #1766) - class_body / struct_body / interface_body / enum_body: added semicolon-body alternative '| ;' (PR #1766) - base_argument_list moved to non-record class context; record_class_body and record_struct_body productions eliminated (PR #1766) - explicit_anonymous_function_signature simplified to '(' parameter_list? ')' reusing standard parameter_list (PR #1623) - parameter_mode_modifier uses ref_kind (PR #1624) - using_alias_directive: added 'unsafe'? and (namespace_name | type) (PR #1622); using_static_directive: added 'unsafe'? (PR #1622) - Source-comment section numbers updated throughout grammar.md Eight independently reviewed manual link corrections applied to the generated renumber output before commit (reviewed by Bill Wagner): - expressions.md: lower-bound inference link corrected from §12.6.3.10 (exact inferences) to §12.6.3.11 (lower-bound inferences) - namespaces.md: pointer-types link corrected from attributes.md §23.3 (attribute specification) to unsafe-code.md §24.3 (pointer types) - classes.md §15.16.4.6.2: symbolic §prim-constructor resolved to [§15.11.6] - classes.md §15.17.1: symbolic §collection-expressions resolved to [§12.8.25] - classes.md §15.17.1: symbolic §imp-collection-expression-conv resolved to [§10.2.22] - classes.md §15.17.1: symbolic §collection-builder-attr resolved to [§23.5.12] - classes.md §15.17.2: symbolic §collection-construction resolved to [§15.17.2] - classes.md §15.17.2: symbolic §declaring-a-collection-type-general resolved to [§15.17.1] This commit does not represent ECMA approval of any feature. All six source PRs remain open and unreviewed by the ECMA TC49-TG2 committee. The alpha-v12 branch is a working synthesis for committee review. Pending committee review flags (carried from feature commits): - expressions.md §12.6.3.14: **TBD** marker on lambda inference (PR #1638) - classes.md / conversions.md: PR #1623 Binder changes omitted per decision in session 7c07b608 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 7c07b608-2471-41d5-845a-152b2378a43d
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This is Rex's adaptation of the corresponding MS proposal.