Only set types of conditional expressions in strong mode.

pkg/front_end/testcases/inference/infer_assign_to_index_super.dart.direct.expect

 library test;
 import self as self;
 import "dart:core" as core;
 
 class Index extends core::Object {
   constructor •() → void
     : super core::Object::•()
     ;
 }
 class A extends core::Object {
@@ skipping 26 matching lines @@
   operator [](self::Index i) → self::B
     return null;
   operator []=(self::Index i, self::B v) → void {}
 }
 class Test extends self::Base {
   constructor •() → void
     : super self::Base::•()
     ;
   method test() → void {
     super.[]=(self::f<dynamic>(), self::f<dynamic>());
-    let final dynamic #t1 = self::f<dynamic>() in super.[](#t1).==(null) ?{dynamic} let final dynamic #t2 = self::f<dynamic>() in let final dynamic #t3 = super.[]=(#t1, #t2) in #t2 : null;
+    let final dynamic #t1 = self::f<dynamic>() in super.[](#t1).==(null) ? let final dynamic #t2 = self::f<dynamic>() in let final dynamic #t3 = super.[]=(#t1, #t2) in #t2 : null;
     let final dynamic #t4 = self::f<dynamic>() in super.[]=(#t4, super.[](#t4).+(self::f<dynamic>()));
     let final dynamic #t5 = self::f<dynamic>() in super.[]=(#t5, super.[](#t5).*(self::f<dynamic>()));
     let final dynamic #t6 = self::f<dynamic>() in super.[]=(#t6, super.[](#t6).&(self::f<dynamic>()));
     let final dynamic #t7 = self::f<dynamic>() in let final dynamic #t8 = super.[](#t7).-(1) in let final dynamic #t9 = super.[]=(#t7, #t8) in #t8;
     let final dynamic #t10 = self::f<dynamic>() in super.[]=(#t10, super.[](#t10).-(1));
     dynamic v1 = let final dynamic #t11 = self::f<dynamic>() in let final dynamic #t12 = self::f<dynamic>() in let final dynamic #t13 = super.[]=(#t11, #t12) in #t12;
-    dynamic v2 = let final dynamic #t14 = self::f<dynamic>() in let final dynamic #t15 = super.[](#t14) in #t15.==(null) ?{dynamic} let final dynamic #t16 = self::f<dynamic>() in let final dynamic #t17 = super.[]=(#t14, #t16) in #t16 : #t15;
+    dynamic v2 = let final dynamic #t14 = self::f<dynamic>() in let final dynamic #t15 = super.[](#t14) in #t15.==(null) ? let final dynamic #t16 = self::f<dynamic>() in let final dynamic #t17 = super.[]=(#t14, #t16) in #t16 : #t15;
     dynamic v3 = let final dynamic #t18 = self::f<dynamic>() in let final dynamic #t19 = super.[](#t18).+(self::f<dynamic>()) in let final dynamic #t20 = super.[]=(#t18, #t19) in #t19;
     dynamic v4 = let final dynamic #t21 = self::f<dynamic>() in let final dynamic #t22 = super.[](#t21).*(self::f<dynamic>()) in let final dynamic #t23 = super.[]=(#t21, #t22) in #t22;
     dynamic v5 = let final dynamic #t24 = self::f<dynamic>() in let final dynamic #t25 = super.[](#t24).&(self::f<dynamic>()) in let final dynamic #t26 = super.[]=(#t24, #t25) in #t25;
     dynamic v6 = let final dynamic #t27 = self::f<dynamic>() in let final dynamic #t28 = super.[](#t27).-(1) in let final dynamic #t29 = super.[]=(#t27, #t28) in #t28;
     dynamic v7 = let final dynamic #t30 = self::f<dynamic>() in let final dynamic #t31 = super.[](#t30) in let final dynamic #t32 = super.[]=(#t30, #t31.-(1)) in #t31;
   }
 }
 static method f<T extends core::Object>() → self::f::T
   return null;
 static method main() → dynamic {}