library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd/issue42758.dart:7:17: Warning: Operand of null-aware operation '...?' has type 'Never' which excludes null.
//   var l2 = [...?n1];
//                 ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:8:16: Error: Can't spread a value with static type 'Never?'.
//   var l3 = [...n2];
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:10:16: Error: Can't spread a value with static type 'Null'.
//   var l5 = [...n3];
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:13:17: Warning: Operand of null-aware operation '...?' has type 'Never' which excludes null.
//   var s2 = {...?n1, n1};
//                 ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:14:16: Error: Can't spread a value with static type 'Never?'.
//   var s3 = {...n2, n1};
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:16:16: Error: Can't spread a value with static type 'Null'.
//   var s5 = {...n3, n1};
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:19:17: Warning: Operand of null-aware operation '...?' has type 'Never' which excludes null.
//   var m2 = {...?n1, n1: n1};
//                 ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:20:16: Error: Can't spread a value with static type 'Never?'.
//   var m3 = {...n2, n1: n1};
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:22:16: Error: Can't spread a value with static type 'Null'.
//   var m5 = {...n3, n1: n1};
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:29:17: Warning: Operand of null-aware operation '...?' has type 'N1' which excludes null.
//   var l2 = [...?n1];
//                 ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:30:16: Error: Can't spread a value with static type 'N2'.
//   var l3 = [...n2];
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:32:16: Error: Can't spread a value with static type 'N3'.
//   var l5 = [...n3];
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:35:17: Warning: Operand of null-aware operation '...?' has type 'N1' which excludes null.
//   var s2 = {...?n1, n1};
//                 ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:36:16: Error: Can't spread a value with static type 'N2'.
//   var s3 = {...n2, n1};
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:38:16: Error: Can't spread a value with static type 'N3'.
//   var s5 = {...n3, n1};
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:41:17: Warning: Operand of null-aware operation '...?' has type 'N1' which excludes null.
//   var m2 = {...?n1, n1: n1};
//                 ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:42:16: Error: Can't spread a value with static type 'N2'.
//   var m3 = {...n2, n1: n1};
//                ^
//
// pkg/front_end/testcases/nnbd/issue42758.dart:44:16: Error: Can't spread a value with static type 'N3'.
//   var m5 = {...n3, n1: n1};
//                ^
//
import self as self;
import "dart:core" as core;
import "dart:_internal" as _in;
import "dart:collection" as col;

static method test1(Never n1, Never? n2, Null n3) → dynamic {
  core::List<Never> l1 = block {
    final core::List<Never> #t1 = core::List::of<Never>(let final Never #t2 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."));
  } =>#t1;
  core::List<Never> l2 = block {
    final core::List<Never> #t3 = core::_GrowableList::•<Never>(0);
    final core::Iterable<Never>? #t4 = let final Never #t5 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
    if(!(#t4 == null))
      #t3.{core::List::addAll}{Invariant}(#t4{core::Iterable<Never>}){(core::Iterable<Never>) → void};
  } =>#t3;
  core::List<dynamic> l3 = core::_GrowableList::_literal1<dynamic>(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:8:16: Error: Can't spread a value with static type 'Never?'.
  var l3 = [...n2];
               ^");
  core::List<Never> l4 = block {
    final core::List<Never> #t6 = core::_GrowableList::•<Never>(0);
    final core::Iterable<Never>? #t7 = n2;
    if(!(#t7 == null))
      #t6.{core::List::addAll}{Invariant}(#t7{core::Iterable<Never>}){(core::Iterable<Never>) → void};
  } =>#t6;
  core::List<dynamic> l5 = core::_GrowableList::_literal1<dynamic>(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:10:16: Error: Can't spread a value with static type 'Null'.
  var l5 = [...n3];
               ^");
  core::List<Never> l6 = block {
    final core::List<Never> #t8 = core::_GrowableList::•<Never>(0);
    final core::Iterable<Never>? #t9 = n3;
    if(!(#t9 == null))
      #t8.{core::List::addAll}{Invariant}(#t9{core::Iterable<Never>}){(core::Iterable<Never>) → void};
  } =>#t8;
  core::Set<Never> s1 = block {
    final core::Set<Never> #t10 = col::LinkedHashSet::of<Never>(let final Never #t11 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."));
    #t10.{core::Set::add}{Invariant}(let final Never #t12 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never) → core::bool};
  } =>#t10;
  core::Set<Never> s2 = block {
    final core::Set<Never> #t13 = new col::_CompactLinkedHashSet::•<Never>();
    final core::Iterable<Never>? #t14 = let final Never #t15 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
    if(!(#t14 == null))
      #t13.{core::Set::addAll}{Invariant}(#t14{core::Iterable<Never>}){(core::Iterable<Never>) → void};
    #t13.{core::Set::add}{Invariant}(let final Never #t16 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never) → core::bool};
  } =>#t13;
  core::Set<dynamic> s3 = block {
    final core::Set<dynamic> #t17 = new col::_CompactLinkedHashSet::•<dynamic>();
    #t17.{core::Set::add}{Invariant}(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:14:16: Error: Can't spread a value with static type 'Never?'.
  var s3 = {...n2, n1};
               ^"){(dynamic) → core::bool};
    #t17.{core::Set::add}{Invariant}(let final Never #t18 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(dynamic) → core::bool};
  } =>#t17;
  core::Set<Never> s4 = block {
    final core::Set<Never> #t19 = new col::_CompactLinkedHashSet::•<Never>();
    final core::Iterable<Never>? #t20 = n2;
    if(!(#t20 == null))
      #t19.{core::Set::addAll}{Invariant}(#t20{core::Iterable<Never>}){(core::Iterable<Never>) → void};
    #t19.{core::Set::add}{Invariant}(let final Never #t21 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never) → core::bool};
  } =>#t19;
  core::Set<dynamic> s5 = block {
    final core::Set<dynamic> #t22 = new col::_CompactLinkedHashSet::•<dynamic>();
    #t22.{core::Set::add}{Invariant}(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:16:16: Error: Can't spread a value with static type 'Null'.
  var s5 = {...n3, n1};
               ^"){(dynamic) → core::bool};
    #t22.{core::Set::add}{Invariant}(let final Never #t23 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(dynamic) → core::bool};
  } =>#t22;
  core::Set<Never> s6 = block {
    final core::Set<Never> #t24 = new col::_CompactLinkedHashSet::•<Never>();
    final core::Iterable<Never>? #t25 = n3;
    if(!(#t25 == null))
      #t24.{core::Set::addAll}{Invariant}(#t25{core::Iterable<Never>}){(core::Iterable<Never>) → void};
    #t24.{core::Set::add}{Invariant}(let final Never #t26 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never) → core::bool};
  } =>#t24;
  core::Map<Never, Never> m1 = block {
    final core::Map<Never, Never> #t27 = <Never, Never>{};
    {
      core::Iterator<core::MapEntry<Never, Never>> :sync-for-iterator = (let final Never #t28 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")).{core::Map::entries}{core::Iterable<core::MapEntry<Never, Never>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<Never, Never>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<Never, Never> #t29 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<Never, Never>};
        #t27.{core::Map::[]=}{Invariant}(#t29.{core::MapEntry::key}{Never}, #t29.{core::MapEntry::value}{Never}){(Never, Never) → void};
      }
    }
    #t27.{core::Map::[]=}{Invariant}(let final Never #t30 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final Never #t31 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never, Never) → void};
  } =>#t27;
  core::Map<Never, Never> m2 = block {
    final core::Map<Never, Never> #t32 = <Never, Never>{};
    final core::Map<Never, Never>? #t33 = let final Never #t34 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
    if(!(#t33 == null)) {
      core::Iterator<core::MapEntry<Never, Never>> :sync-for-iterator = #t33{core::Map<Never, Never>}.{core::Map::entries}{core::Iterable<core::MapEntry<Never, Never>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<Never, Never>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<Never, Never> #t35 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<Never, Never>};
        #t32.{core::Map::[]=}{Invariant}(#t35.{core::MapEntry::key}{Never}, #t35.{core::MapEntry::value}{Never}){(Never, Never) → void};
      }
    }
    #t32.{core::Map::[]=}{Invariant}(let final Never #t36 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final Never #t37 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never, Never) → void};
  } =>#t32;
  core::Map<dynamic, dynamic> m3 = <dynamic, dynamic>{invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:20:16: Error: Can't spread a value with static type 'Never?'.
  var m3 = {...n2, n1: n1};
               ^": null, let final Never #t38 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."): let final Never #t39 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")};
  core::Map<Never, Never> m4 = block {
    final core::Map<Never, Never> #t40 = <Never, Never>{};
    final core::Map<Never, Never>? #t41 = n2;
    if(!(#t41 == null)) {
      core::Iterator<core::MapEntry<Never, Never>> :sync-for-iterator = #t41{core::Map<Never, Never>}.{core::Map::entries}{core::Iterable<core::MapEntry<Never, Never>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<Never, Never>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<Never, Never> #t42 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<Never, Never>};
        #t40.{core::Map::[]=}{Invariant}(#t42.{core::MapEntry::key}{Never}, #t42.{core::MapEntry::value}{Never}){(Never, Never) → void};
      }
    }
    #t40.{core::Map::[]=}{Invariant}(let final Never #t43 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final Never #t44 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never, Never) → void};
  } =>#t40;
  core::Map<dynamic, dynamic> m5 = <dynamic, dynamic>{invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:22:16: Error: Can't spread a value with static type 'Null'.
  var m5 = {...n3, n1: n1};
               ^": null, let final Never #t45 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."): let final Never #t46 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")};
  core::Map<Never, Never> m6 = block {
    final core::Map<Never, Never> #t47 = <Never, Never>{};
    final core::Map<Never, Never>? #t48 = n3;
    if(!(#t48 == null)) {
      core::Iterator<core::MapEntry<Never, Never>> :sync-for-iterator = #t48{core::Map<Never, Never>}.{core::Map::entries}{core::Iterable<core::MapEntry<Never, Never>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<Never, Never>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<Never, Never> #t49 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<Never, Never>};
        #t47.{core::Map::[]=}{Invariant}(#t49.{core::MapEntry::key}{Never}, #t49.{core::MapEntry::value}{Never}){(Never, Never) → void};
      }
    }
    #t47.{core::Map::[]=}{Invariant}(let final Never #t50 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final Never #t51 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(Never, Never) → void};
  } =>#t47;
}
static method test2<N1 extends Never, N2 extends Never?, N3 extends Null>(self::test2::N1 n1, self::test2::N2% n2, self::test2::N3% n3) → dynamic {
  core::List<Never> l1 = block {
    final core::List<Never> #t52 = core::List::of<Never>(let final self::test2::N1 #t53 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."));
  } =>#t52;
  core::List<Never> l2 = block {
    final core::List<Never> #t54 = core::_GrowableList::•<Never>(0);
    final core::Iterable<Never>? #t55 = let final self::test2::N1 #t56 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
    if(!(#t55 == null))
      #t54.{core::List::addAll}{Invariant}(#t55{core::Iterable<Never>}){(core::Iterable<Never>) → void};
  } =>#t54;
  core::List<dynamic> l3 = core::_GrowableList::_literal1<dynamic>(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:30:16: Error: Can't spread a value with static type 'N2'.
  var l3 = [...n2];
               ^");
  core::List<Never> l4 = block {
    final core::List<Never> #t57 = core::_GrowableList::•<Never>(0);
    final core::Iterable<Never>? #t58 = n2;
    if(!(#t58 == null))
      #t57.{core::List::addAll}{Invariant}(#t58{core::Iterable<Never>}){(core::Iterable<Never>) → void};
  } =>#t57;
  core::List<dynamic> l5 = core::_GrowableList::_literal1<dynamic>(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:32:16: Error: Can't spread a value with static type 'N3'.
  var l5 = [...n3];
               ^");
  core::List<Never> l6 = block {
    final core::List<Never> #t59 = core::_GrowableList::•<Never>(0);
    final core::Iterable<Never>? #t60 = n3;
    if(!(#t60 == null))
      #t59.{core::List::addAll}{Invariant}(#t60{core::Iterable<Never>}){(core::Iterable<Never>) → void};
  } =>#t59;
  core::Set<self::test2::N1> s1 = block {
    final core::Set<self::test2::N1> #t61 = col::LinkedHashSet::of<self::test2::N1>(let final self::test2::N1 #t62 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."));
    #t61.{core::Set::add}{Invariant}(let final self::test2::N1 #t63 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1) → core::bool};
  } =>#t61;
  core::Set<self::test2::N1> s2 = block {
    final core::Set<self::test2::N1> #t64 = new col::_CompactLinkedHashSet::•<self::test2::N1>();
    final core::Iterable<self::test2::N1>? #t65 = let final self::test2::N1 #t66 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
    if(!(#t65 == null))
      #t64.{core::Set::addAll}{Invariant}(#t65{core::Iterable<self::test2::N1>}){(core::Iterable<self::test2::N1>) → void};
    #t64.{core::Set::add}{Invariant}(let final self::test2::N1 #t67 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1) → core::bool};
  } =>#t64;
  core::Set<dynamic> s3 = block {
    final core::Set<dynamic> #t68 = new col::_CompactLinkedHashSet::•<dynamic>();
    #t68.{core::Set::add}{Invariant}(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:36:16: Error: Can't spread a value with static type 'N2'.
  var s3 = {...n2, n1};
               ^"){(dynamic) → core::bool};
    #t68.{core::Set::add}{Invariant}(let final self::test2::N1 #t69 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(dynamic) → core::bool};
  } =>#t68;
  core::Set<self::test2::N1> s4 = block {
    final core::Set<self::test2::N1> #t70 = new col::_CompactLinkedHashSet::•<self::test2::N1>();
    final core::Iterable<self::test2::N1>? #t71 = n2;
    if(!(#t71 == null))
      #t70.{core::Set::addAll}{Invariant}(#t71{core::Iterable<self::test2::N1>}){(core::Iterable<self::test2::N1>) → void};
    #t70.{core::Set::add}{Invariant}(let final self::test2::N1 #t72 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1) → core::bool};
  } =>#t70;
  core::Set<dynamic> s5 = block {
    final core::Set<dynamic> #t73 = new col::_CompactLinkedHashSet::•<dynamic>();
    #t73.{core::Set::add}{Invariant}(invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:38:16: Error: Can't spread a value with static type 'N3'.
  var s5 = {...n3, n1};
               ^"){(dynamic) → core::bool};
    #t73.{core::Set::add}{Invariant}(let final self::test2::N1 #t74 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(dynamic) → core::bool};
  } =>#t73;
  core::Set<self::test2::N1> s6 = block {
    final core::Set<self::test2::N1> #t75 = new col::_CompactLinkedHashSet::•<self::test2::N1>();
    final core::Iterable<self::test2::N1>? #t76 = n3;
    if(!(#t76 == null))
      #t75.{core::Set::addAll}{Invariant}(#t76{core::Iterable<self::test2::N1>}){(core::Iterable<self::test2::N1>) → void};
    #t75.{core::Set::add}{Invariant}(let final self::test2::N1 #t77 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1) → core::bool};
  } =>#t75;
  core::Map<self::test2::N1, self::test2::N1> m1 = block {
    final core::Map<self::test2::N1, self::test2::N1> #t78 = <self::test2::N1, self::test2::N1>{};
    {
      core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>> :sync-for-iterator = (let final self::test2::N1 #t79 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")).{core::Map::entries}{core::Iterable<core::MapEntry<self::test2::N1, self::test2::N1>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<self::test2::N1, self::test2::N1> #t80 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<self::test2::N1, self::test2::N1>};
        #t78.{core::Map::[]=}{Invariant}(#t80.{core::MapEntry::key}{self::test2::N1}, #t80.{core::MapEntry::value}{self::test2::N1}){(self::test2::N1, self::test2::N1) → void};
      }
    }
    #t78.{core::Map::[]=}{Invariant}(let final self::test2::N1 #t81 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final self::test2::N1 #t82 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1, self::test2::N1) → void};
  } =>#t78;
  core::Map<self::test2::N1, self::test2::N1> m2 = block {
    final core::Map<self::test2::N1, self::test2::N1> #t83 = <self::test2::N1, self::test2::N1>{};
    final core::Map<self::test2::N1, self::test2::N1>? #t84 = let final self::test2::N1 #t85 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.");
    if(!(#t84 == null)) {
      core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>> :sync-for-iterator = #t84{core::Map<self::test2::N1, self::test2::N1>}.{core::Map::entries}{core::Iterable<core::MapEntry<self::test2::N1, self::test2::N1>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<self::test2::N1, self::test2::N1> #t86 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<self::test2::N1, self::test2::N1>};
        #t83.{core::Map::[]=}{Invariant}(#t86.{core::MapEntry::key}{self::test2::N1}, #t86.{core::MapEntry::value}{self::test2::N1}){(self::test2::N1, self::test2::N1) → void};
      }
    }
    #t83.{core::Map::[]=}{Invariant}(let final self::test2::N1 #t87 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final self::test2::N1 #t88 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1, self::test2::N1) → void};
  } =>#t83;
  core::Map<dynamic, dynamic> m3 = <dynamic, dynamic>{invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:42:16: Error: Can't spread a value with static type 'N2'.
  var m3 = {...n2, n1: n1};
               ^": null, let final self::test2::N1 #t89 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."): let final self::test2::N1 #t90 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")};
  core::Map<self::test2::N1, self::test2::N1> m4 = block {
    final core::Map<self::test2::N1, self::test2::N1> #t91 = <self::test2::N1, self::test2::N1>{};
    final core::Map<self::test2::N1, self::test2::N1>? #t92 = n2;
    if(!(#t92 == null)) {
      core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>> :sync-for-iterator = #t92{core::Map<self::test2::N1, self::test2::N1>}.{core::Map::entries}{core::Iterable<core::MapEntry<self::test2::N1, self::test2::N1>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<self::test2::N1, self::test2::N1> #t93 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<self::test2::N1, self::test2::N1>};
        #t91.{core::Map::[]=}{Invariant}(#t93.{core::MapEntry::key}{self::test2::N1}, #t93.{core::MapEntry::value}{self::test2::N1}){(self::test2::N1, self::test2::N1) → void};
      }
    }
    #t91.{core::Map::[]=}{Invariant}(let final self::test2::N1 #t94 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final self::test2::N1 #t95 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1, self::test2::N1) → void};
  } =>#t91;
  core::Map<dynamic, dynamic> m5 = <dynamic, dynamic>{invalid-expression "pkg/front_end/testcases/nnbd/issue42758.dart:44:16: Error: Can't spread a value with static type 'N3'.
  var m5 = {...n3, n1: n1};
               ^": null, let final self::test2::N1 #t96 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."): let final self::test2::N1 #t97 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")};
  core::Map<self::test2::N1, self::test2::N1> m6 = block {
    final core::Map<self::test2::N1, self::test2::N1> #t98 = <self::test2::N1, self::test2::N1>{};
    final core::Map<self::test2::N1, self::test2::N1>? #t99 = n3;
    if(!(#t99 == null)) {
      core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>> :sync-for-iterator = #t99{core::Map<self::test2::N1, self::test2::N1>}.{core::Map::entries}{core::Iterable<core::MapEntry<self::test2::N1, self::test2::N1>>}.{core::Iterable::iterator}{core::Iterator<core::MapEntry<self::test2::N1, self::test2::N1>>};
      for (; :sync-for-iterator.{core::Iterator::moveNext}(){() → core::bool}; ) {
        final core::MapEntry<self::test2::N1, self::test2::N1> #t100 = :sync-for-iterator.{core::Iterator::current}{core::MapEntry<self::test2::N1, self::test2::N1>};
        #t98.{core::Map::[]=}{Invariant}(#t100.{core::MapEntry::key}{self::test2::N1}, #t100.{core::MapEntry::value}{self::test2::N1}){(self::test2::N1, self::test2::N1) → void};
      }
    }
    #t98.{core::Map::[]=}{Invariant}(let final self::test2::N1 #t101 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`."), let final self::test2::N1 #t102 = n1 in throw new _in::ReachabilityError::•("`null` encountered as the result from expression with type `Never`.")){(self::test2::N1, self::test2::N1) → void};
  } =>#t98;
}
static method main() → dynamic {}