Merge kernel closure conversion into the Dart SDK

pkg/kernel/testcases/closures/for_variable_capture_test.dart.expect

+library;
+import self as self;
+import "dart:core" as core;
+import "dart:mock" as mock;
+
+class Closure#main#function extends core::Object implements core::Function {
+  field core::String note = "This is temporary. The VM doesn't need closure classes.";
+  field mock::Context context;
+  constructor •(final mock::Context context) → dynamic
+    : self::Closure#main#function::context = context
+    ;
+  method call() → dynamic {
+    "This is a temporary solution. In the VM, this will become an additional parameter.";
+    final mock::Context #contextParameter = this.{self::Closure#main#function::context};
+    return #contextParameter.[](0);
+  }
+}
+static method main() → dynamic {
+  dynamic closure;
+  {
+    mock::Context #context = new mock::Context::•(1);
+    #context.parent = null;
+    #context.[]=(0, 0);
+    dynamic fn = new self::Closure#main#function::•(#context);
+    for (; #context.[](0).<(3); #context = #context.copy(), #context.[]=(0, #context.[](0).+(1))) {
+      #context.[]=(0, #context.[](0).+(1));
+      closure = fn;
+    }
+  }
+  dynamic x = closure.call();
+  if(!x.==(1)) {
+    throw "Expected 1, but got ${x}.";
+  }
+}