compiler testdata: s/trait/interface

compiler/testData/diagnostics/tests/inference/upperBounds/doNotInferFromBoundsOnly.kt

@@ -1,6 +1,6 @@
 package a
 
-trait A
+interface A
 
 fun <T> emptyList(): List<T> = throw Exception()
 

compiler/testData/diagnostics/tests/inference/upperBounds/intersectUpperBounds.kt

@@ -2,11 +2,11 @@
 
 package s
 
-trait In<in T>
+interface In<in T>
 
-trait A
-trait B
-trait C: A, B
+interface A
+interface B
+interface C: A, B
 
 fun <T> foo(in1: In<T>, in2: In<T>): T = throw Exception("$in1 $in2")
 

compiler/testData/diagnostics/tests/inference/upperBounds/nonNullUpperBound.kt

@@ -4,7 +4,7 @@ fun <T: Any> foo(v: Any): T? = unescape(v)
 
 //--------------
 
-trait A
+interface A
 
 fun <R : A> unescapeA(value: Any): R? = throw Exception("$value")