diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/AmbiguityOnLazyTypeComputation.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/AmbiguityOnLazyTypeComputation.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/AmbiguityOnLazyTypeComputation.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/AmbiguityOnLazyTypeComputation.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/AssignmentsUnderOperators.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/AssignmentsUnderOperators.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/AssignmentsUnderOperators.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/AssignmentsUnderOperators.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/CoercionToUnit.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/CoercionToUnit.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/CoercionToUnit.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/CoercionToUnit.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/DoubleDefine.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/DoubleDefine.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/DoubleDefine.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/DoubleDefine.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/ErrorsOnIbjectExpressionsAsParameters.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/ErrorsOnIbjectExpressionsAsParameters.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/ErrorsOnIbjectExpressionsAsParameters.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/ErrorsOnIbjectExpressionsAsParameters.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet11.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet11.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet11.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet11.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet121.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet121.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet121.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet121.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet124.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet124.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet124.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet124.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet169.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet169.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet169.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet169.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet17.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet17.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet17.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet17.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet183-1.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet183-1.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet183-1.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet183-1.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet183.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet183.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet183.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet183.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet53.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet53.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet53.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet53.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet67.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet67.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet67.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet67.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet68.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet68.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet68.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet68.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet69.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet69.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet69.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet69.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet72.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet72.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet72.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet72.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/Jet81.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/Jet81.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/Jet81.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/Jet81.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/OverrideResolution.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/OverrideResolution.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/OverrideResolution.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/OverrideResolution.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/ScopeForSecondaryConstructors.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/ScopeForSecondaryConstructors.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/ScopeForSecondaryConstructors.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/ScopeForSecondaryConstructors.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/SpecififcityByReceiver.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/SpecififcityByReceiver.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/SpecififcityByReceiver.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/SpecififcityByReceiver.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/ThisConstructorInGenericClass.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/ThisConstructorInGenericClass.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/ThisConstructorInGenericClass.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/ThisConstructorInGenericClass.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/WrongTraceInCallResolver.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/WrongTraceInCallResolver.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/WrongTraceInCallResolver.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/WrongTraceInCallResolver.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt251.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt251.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt251.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt251.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt258.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt258.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt258.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt258.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt287.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt287.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt287.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt287.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt303.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt303.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt303.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt303.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt313.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt313.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt313.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt313.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt335.336.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt335.336.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt335.336.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt335.336.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt385.109.441.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt385.109.441.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt385.109.441.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt385.109.441.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt402.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt402.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt402.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt402.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt459.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt459.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt459.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt459.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt469.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt469.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt469.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt469.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt549.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt549.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt549.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt549.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt58.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt58.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt58.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt58.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt580.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt580.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt580.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt580.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/regression/kt588.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt588.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/regression/kt588.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt588.jet
diff --git a/compiler/testData/checkerWithErrorTypes/quick/kt600.jet b/compiler/testData/checkerWithErrorTypes/quick/regressions/kt600.jet
similarity index 100%
rename from compiler/testData/checkerWithErrorTypes/quick/kt600.jet
rename to compiler/testData/checkerWithErrorTypes/quick/regressions/kt600.jet