Paul Berry
e933e91aaa
This is a reland of 6a1c54ec30
Original change's description:
> Flow analysis: promote to non-nullable on initialization
>
> When flow analysis encounters a variable declaration of the form `T? x
> = expr;`, if the type of `expr` is `T`, then the variable is
> immediately promoted to type `T`.
>
> Fixes #43099.
>
> Change-Id: Ia206fe0d50e2fdd9bdf637e13c85633d8490dbcc
> Bug: https://github.com/dart-lang/sdk/issues/43099
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/163841
> Commit-Queue: Paul Berry <paulberry@google.com>
> Reviewed-by: Bob Nystrom <rnystrom@google.com>
> Reviewed-by: Johnni Winther <johnniwinther@google.com>
> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Bug: https://github.com/dart-lang/sdk/issues/43099
Change-Id: I7530bb0f7c24674a7b500558b89d50b35e045aca
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166305
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
23 lines
987 B
Plaintext
23 lines
987 B
Plaintext
library /*isNonNullableByDefault*/;
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import self as self;
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import "dart:core" as core;
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class Class extends core::Object {
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field self::Class? field;
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constructor •([self::Class? field = #C1]) → self::Class
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: self::Class::field = field, super core::Object::•()
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;
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get getter1() → self::Class
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return this;
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get getter2() → self::Class?
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return this.{self::Class::field};
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}
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static method main() → dynamic {
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self::Class? c = new self::Class::•() as{ForNonNullableByDefault} self::Class?;
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let final self::Class? #t1 = c in #t1.{core::Object::==}(null) ?{self::Class?} null : let final self::Class? #t2 = #t1{self::Class}.{self::Class::getter1}.{self::Class::getter2} in #t2.{core::Object::==}(null) ?{self::Class?} null : let final self::Class? #t3 = #t2{self::Class}.{self::Class::getter1}.{self::Class::getter2} in #t3.{core::Object::==}(null) ?{self::Class?} null : #t3{self::Class}.{self::Class::field} = c{self::Class};
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}
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constants {
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#C1 = null
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}
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