Johnni Winther
c6347389d2
This moves pattern variable assignments of fully matched expressions into the case body. This will help backends (dart2js in particular) to reason about the code flow. Closes #54115 Change-Id: I598a384a829f16e91ab2d6a309499cf20b9cc121 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/339122 Commit-Queue: Johnni Winther <johnniwinther@google.com> Reviewed-by: Jens Johansen <jensj@google.com>
40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
library;
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import self as self;
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import "dart:core" as core;
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static method test(dynamic x) → dynamic {
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{
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hoisted core::String y;
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final synthesized dynamic #0#0 = x;
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synthesized dynamic #0#6;
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synthesized core::bool #0#6#isSet = false;
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if(#0#0 is core::List<dynamic> && #0#0{core::List<dynamic>}.{core::List::length}{core::int} =={core::num::==}{(core::Object) → core::bool} #C1 && (#0#6#isSet ?{dynamic} #0#6{dynamic} : let final dynamic #t1 = #0#6#isSet = true in #0#6 = #0#0{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic}) is core::String) {
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y = (#0#6#isSet ?{dynamic} #0#6{dynamic} : let final dynamic #t2 = #0#6#isSet = true in #0#6 = #0#0{core::List<dynamic>}.{core::List::[]}(0){(core::int) → dynamic}) as{Unchecked} core::String;
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{
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return y;
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}
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}
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else {
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return null;
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}
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}
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}
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static method main() → dynamic {
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self::expectEquals(self::test(<core::String>["one", "two", "three"]), null);
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self::expectEquals(self::test(<core::String>["one"]), "one");
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self::expectEquals(self::test(<core::int>[1, 2, 3]), null);
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self::expectEquals(self::test(<core::int>[1]), null);
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self::expectEquals(self::test(<core::bool>[true, false]), null);
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self::expectEquals(self::test(<core::bool>[true]), null);
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self::expectEquals(self::test(<dynamic>[]), null);
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}
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static method expectEquals(dynamic x, dynamic y) → dynamic {
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if(!(x =={core::Object::==}{(core::Object) → core::bool} y)) {
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throw "Expected ${x} to be equal to ${y}.";
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}
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}
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constants {
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#C1 = 1
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}
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