Implement type inference of constructor invocations in Fasta.

pkg/front_end/testcases/inference/downwards_inference_on_constructor_arguments_infer_downwards.dart.strong.expect

Index: pkg/front_end/testcases/inference/downwards_inference_on_constructor_arguments_infer_downwards.dart.strong.expect
diff --git a/pkg/front_end/testcases/inference/downwards_inference_on_constructor_arguments_infer_downwards.dart.strong.expect b/pkg/front_end/testcases/inference/downwards_inference_on_constructor_arguments_infer_downwards.dart.strong.expect
new file mode 100644
index 0000000000000000000000000000000000000000..2e3ce89d42c7cfdbdf6e3aa16b14bc7f45342230
--- /dev/null
+++ b/pkg/front_end/testcases/inference/downwards_inference_on_constructor_arguments_infer_downwards.dart.strong.expect
@@ -0,0 +1,46 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class F0 extends core::Object {
+  constructor •(core::List<core::int> a) → void
+    : super core::Object::•() {}
+}
+class F1 extends core::Object {
+  constructor •({core::List<core::int> a = null}) → void
+    : super core::Object::•() {}
+}
+class F2 extends core::Object {
+  constructor •(core::Iterable<core::int> a) → void
+    : super core::Object::•() {}
+}
+class F3 extends core::Object {
+  constructor •(core::Iterable<core::Iterable<core::int>> a) → void
+    : super core::Object::•() {}
+}
+class F4 extends core::Object {
+  constructor •({core::Iterable<core::Iterable<core::int>> a = null}) → void
+    : super core::Object::•() {}
+}
+static method main() → void {
+  new self::F0::•(<core::int>[]);
+  new self::F0::•(<core::int>[3]);
+  new self::F0::•(<core::int>["hello"]);
+  new self::F0::•(<core::int>["hello", 3]);
+  new self::F1::•(a: <core::int>[]);
+  new self::F1::•(a: <core::int>[3]);
+  new self::F1::•(a: <core::int>["hello"]);
+  new self::F1::•(a: <core::int>["hello", 3]);
+  new self::F2::•(<core::int>[]);
+  new self::F2::•(<core::int>[3]);
+  new self::F2::•(<core::int>["hello"]);
+  new self::F2::•(<core::int>["hello", 3]);
+  new self::F3::•(<core::Iterable<core::int>>[]);
+  new self::F3::•(<core::Iterable<core::int>>[<core::int>[3]]);
+  new self::F3::•(<core::Iterable<core::int>>[<core::int>["hello"]]);
+  new self::F3::•(<core::Iterable<core::int>>[<core::int>["hello"], <core::int>[3]]);
+  new self::F4::•(a: <core::Iterable<core::int>>[]);
+  new self::F4::•(a: <core::Iterable<core::int>>[<core::int>[3]]);
+  new self::F4::•(a: <core::Iterable<core::int>>[<core::int>["hello"]]);
+  new self::F4::•(a: <core::Iterable<core::int>>[<core::int>["hello"], <core::int>[3]]);
+}