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Support static abstract variables and require initializers

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This CL adds a grammar rule to Dart.g and Dart.g4 such that a
variable declaration can be `static abstract`. It also changes the rule
for `static final` and `static const` variable declarations such that
it is a syntax error if they do not have an initializing expression.

This restores the approach which was used before augmentations were
added. It is possible to do this because the added flexibility
would only allow cases which are intended to be an error, because it
is no longer possible to "override" or "extend" an implementation
in an augmenting declaration.

Change-Id: Id7696880a948697678eaf368c69c390b9c8f4e7f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/485440
Commit-Queue: Erik Ernst <eernst@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
This commit is contained in:
Erik Ernst
2026-03-04 04:24:07 -08:00
committed by Commit Queue
parent 92c362a8b0
commit 05ae94dc91
2 changed files with 10 additions and 2 deletions
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tools/spec_parser/Dart.g
+5 -1
View File
@@ -4,6 +4,9 @@
// CHANGES:
//
// v0.60 Adjust the `static final` and `static const` variable declarations
// to require an initializing expression.
//
// v0.59 Adjust augmentation and primary constructor related rules to match
// recent updates.
//
@@ -535,7 +538,8 @@ declaration
| EXTERNAL (STATIC? finalVarOrType | COVARIANT varOrType) identifierList
| EXTERNAL? operatorSignature
| ABSTRACT (finalVarOrType | COVARIANT varOrType) identifierList
| STATIC (FINAL | CONST) type? initializedIdentifierList
| STATIC ABSTRACT finalVarOrType identifierList
| STATIC (FINAL | CONST) type? staticFinalDeclarationList
| STATIC LATE FINAL type? initializedIdentifierList
| STATIC LATE? varOrType initializedIdentifierList
| COVARIANT LATE FINAL type? identifierList
tools/spec_parser/dart_spec_parser/Dart.g4
+5 -1
View File
@@ -4,6 +4,9 @@
// CHANGES:
//
// v0.61 Adjust the `static final` and `static const` variable declarations
// to require an initializing expression.
//
// v0.60 Adjust augmentation and primary constructor related rules to match
// recent updates.
//
@@ -557,7 +560,8 @@ declaration
| EXTERNAL (STATIC? finalVarOrType | COVARIANT varOrType) identifierList
| EXTERNAL? operatorSignature
| ABSTRACT (finalVarOrType | COVARIANT varOrType) identifierList
| STATIC (FINAL | CONST) type? initializedIdentifierList
| STATIC ABSTRACT finalVarOrType identifierList
| STATIC (FINAL | CONST) type? staticFinalDeclarationList
| STATIC LATE FINAL type? initializedIdentifierList
| STATIC LATE? varOrType initializedIdentifierList
| COVARIANT LATE FINAL type? identifierList