KT-2317 Wrong UNNECESSARY_SAFE_CALL

#KT-2317 Fixed

compiler/frontend/src/org/jetbrains/jet/lang/resolve/calls/CallResolver.java

@@ -758,7 +758,7 @@ public class CallResolver {
                     result = OTHER_ERROR;
                 }
             }
-            if (safeAccess && (receiverParameter.getType().isNullable() || !receiverArgumentType.isNullable())) {
+            if (safeAccess && !receiverArgumentType.isNullable()) {
                 context.tracing.unnecessarySafeCall(context.candidateCall.getTrace(), receiverArgumentType);
             }
         }

compiler/testData/diagnostics/tests/extensions/ExtensionFunctions.jet

@@ -66,7 +66,7 @@ import outer.*
             command.equals(null)
             command?.equals(null)
             command.equals1(null)
-            command<!UNNECESSARY_SAFE_CALL!>?.<!>equals1(null)
+            command?.equals1(null)
 
             val c = Command()
             c<!UNNECESSARY_SAFE_CALL!>?.<!>equals2(null)

compiler/testData/diagnostics/tests/extensions/kt2317.jet

@@ -0,0 +1,15 @@
+//KT-2317 Wrong UNNECESSARY_SAFE_CALL
+
+package kt2317
+
+fun Any?.baz() = 1
+
+fun foo(l: Long?) = l?.baz()
+
+
+fun Any?.bar(): Unit { }
+
+fun quux(x: Int?): Unit {
+	x?.baz()
+	x?.bar()
+}

compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/InfixCallNullability.jet

@@ -32,7 +32,7 @@ fun test(x : Int?, a : A?) {
     a.times(1)
     a * 1
     a times 1
-    a<!UNNECESSARY_SAFE_CALL!>?.<!>times(1)
+    a?.times(1)
 
     1 <!UNSAFE_INFIX_CALL!>in<!> a
     a <!UNSAFE_INFIX_CALL!>contains<!> 1

compiler/testData/diagnostics/tests/nullabilityAndAutoCasts/ReceiverNullability.jet

@@ -12,7 +12,7 @@ fun test(a : A?) {
 
     a?.foo()
     a?.bar()
-    a<!UNNECESSARY_SAFE_CALL!>?.<!>buzz() // warning
+    a?.buzz()
 }
 
 fun A.test2() {
@@ -40,5 +40,5 @@ fun A?.test3() {
 
     this?.foo()
     this?.bar()
-    this<!UNNECESSARY_SAFE_CALL!>?.<!>buzz() // warning
+    this?.buzz()
 }

compiler/testData/diagnostics/tests/regressions/kt557.jet

@@ -5,5 +5,5 @@ fun Array<String>.length() : Int {
 }
 
 fun test(array : Array<String?>?) {
-    array<!UNNECESSARY_SAFE_CALL!>?.<!>sure<Array<String?>>()<!UNSAFE_CALL!>.<!>length()
+    array?.sure<Array<String?>>()<!UNSAFE_CALL!>.<!>length()
 }

idea/testData/checker/ExtensionFunctions.jet

@@ -61,7 +61,7 @@ fun Int.foo() = this
             command.equals(null)
             command?.equals(null)
             command.equals1(null)
-            command<warning>?.</warning>equals1(null)
+            command?.equals1(null)
 
             val c = Command()
             c<warning>?.</warning>equals2(null)