diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintPosition.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintPosition.kt
similarity index 100%
rename from core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintPosition.java
rename to core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintPosition.kt
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystem.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystem.kt
similarity index 100%
rename from core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystem.java
rename to core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystem.kt
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemImpl.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemImpl.kt
similarity index 100%
rename from core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemImpl.java
rename to core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemImpl.kt
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemStatus.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemStatus.kt
similarity index 100%
rename from core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemStatus.java
rename to core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/ConstraintSystemStatus.kt
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBounds.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBounds.kt
similarity index 100%
rename from core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBounds.java
rename to core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBounds.kt
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBoundsImpl.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBoundsImpl.kt
similarity index 100%
rename from core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBoundsImpl.java
rename to core/descriptors/src/org/jetbrains/jet/lang/resolve/calls/inference/TypeBoundsImpl.kt