compiler testdata: s/trait/interface

compiler/testData/diagnostics/tests/inference/constraints/equalityConstraintOnNullableType.kt

@@ -1,6 +1,6 @@
 // !DIAGNOSTICS: -BASE_WITH_NULLABLE_UPPER_BOUND
 // !CHECK_TYPE
-trait A<T>
+interface A<T>
 
 fun <T> foo(a: A<T>, aN: A<T?>): T = throw Exception("$a $aN")
 

compiler/testData/diagnostics/tests/inference/constraints/kt7351ConstraintFromUnitExpectedType.kt

@@ -2,9 +2,9 @@
 
 package kt7351
 
-trait Node
+interface Node
 
-trait Source<T> {
+interface Source<T> {
     fun f() : T
 }
 fun <T, S : Source<T>> S.woo() : T = this.f()

compiler/testData/diagnostics/tests/inference/constraints/notNullConstraintOnNullableType.kt

@@ -1,9 +1,9 @@
 // !CHECK_TYPE
-trait A<T>
+interface A<T>
 
-trait In<in T>
+interface In<in T>
 
-trait Out<out T>
+interface Out<out T>
 
 fun <T: Any> doT(t: T?): T = throw Exception("$t")
 fun <T: Any> doOut(o: Out<T?>): T { throw Exception("$o") }

compiler/testData/diagnostics/tests/inference/constraints/subtypeConstraintOnNullableType.kt

@@ -1,8 +1,8 @@
 // !DIAGNOSTICS: -BASE_WITH_NULLABLE_UPPER_BOUND
 // !CHECK_TYPE
-trait A<T>
+interface A<T>
 
-trait Out<out T>
+interface Out<out T>
 
 fun <T> foo(a: A<T>, o: Out<T?>): T = throw Exception("$a $o")
 

compiler/testData/diagnostics/tests/inference/constraints/supertypeConstraintOnNullableType.kt

@@ -1,8 +1,8 @@
 // !DIAGNOSTICS: -BASE_WITH_NULLABLE_UPPER_BOUND
 // !CHECK_TYPE
-trait A<T>
+interface A<T>
 
-trait In<in T>
+interface In<in T>
 
 fun <T> foo(a: A<T>, i: In<T>): T = throw Exception("$a $i")