Take coroutineContext into account in RedundantSuspendModifierInspection

#KT-22651: Fixed

compiler/backend-common/src/org/jetbrains/kotlin/backend/common/commonCoroutineCodegenUtil.kt

@@ -58,11 +58,6 @@ fun FunctionDescriptor.getBuiltInSuspendCoroutineOrReturn() =
         .getContributedFunctions(SUSPEND_COROUTINE_OR_RETURN_NAME, NoLookupLocation.FROM_BACKEND)
         .singleOrNull()
 
-fun FunctionDescriptor.isBuiltInCoroutineContext(): Boolean {
-    val fqNameSafe = (this as? PropertyGetterDescriptor)?.correspondingProperty?.fqNameSafe
-    return fqNameSafe == COROUTINE_CONTEXT_1_2_20_FQ_NAME || fqNameSafe == COROUTINE_CONTEXT_FQ_NAME
-}
-
 fun FunctionDescriptor.isBuiltInSuspendCoroutineUninterceptedOrReturn(): Boolean {
     if (name != SUSPEND_COROUTINE_UNINTERCEPTED_OR_RETURN_NAME) return false
     val original = module.getPackage(COROUTINES_INTRINSICS_PACKAGE_FQ_NAME).memberScope

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/coroutineCodegenUtil.kt

@@ -33,6 +33,7 @@ import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.KtExpression
 import org.jetbrains.kotlin.psi.KtPsiFactory
 import org.jetbrains.kotlin.resolve.*
+import org.jetbrains.kotlin.resolve.calls.checkers.isBuiltInCoroutineContext
 import org.jetbrains.kotlin.resolve.calls.model.*
 import org.jetbrains.kotlin.resolve.calls.smartcasts.DataFlowInfo
 import org.jetbrains.kotlin.resolve.calls.tasks.TracingStrategy

compiler/backend/src/org/jetbrains/kotlin/codegen/inline/InlineCodegen.kt

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.codegen.inline
 
 import com.intellij.psi.PsiElement
 import com.intellij.util.ArrayUtil
-import org.jetbrains.kotlin.backend.common.isBuiltInCoroutineContext
 import org.jetbrains.kotlin.backend.common.isBuiltInIntercepted
 import org.jetbrains.kotlin.builtins.BuiltInsPackageFragment
 import org.jetbrains.kotlin.codegen.*
@@ -41,6 +40,7 @@ import org.jetbrains.kotlin.resolve.DescriptorToSourceUtils
 import org.jetbrains.kotlin.resolve.DescriptorUtils
 import org.jetbrains.kotlin.resolve.ImportedFromObjectCallableDescriptor
 import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCallWithAssert
+import org.jetbrains.kotlin.resolve.calls.checkers.isBuiltInCoroutineContext
 import org.jetbrains.kotlin.resolve.calls.model.ResolvedCall
 import org.jetbrains.kotlin.resolve.inline.InlineUtil
 import org.jetbrains.kotlin.resolve.inline.InlineUtil.isInlinableParameterExpression

compiler/frontend/src/org/jetbrains/kotlin/resolve/calls/checkers/coroutineCallChecker.kt

@@ -23,8 +23,10 @@ import org.jetbrains.kotlin.coroutines.hasSuspendFunctionType
 import org.jetbrains.kotlin.descriptors.CallableDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.descriptors.PropertyDescriptor
+import org.jetbrains.kotlin.descriptors.PropertyGetterDescriptor
 import org.jetbrains.kotlin.diagnostics.DiagnosticSink
 import org.jetbrains.kotlin.diagnostics.Errors
+import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.psi.KtExpression
 import org.jetbrains.kotlin.psi.KtThisExpression
@@ -47,6 +49,14 @@ import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 val COROUTINE_CONTEXT_1_2_20_FQ_NAME = DescriptorUtils.COROUTINES_INTRINSICS_PACKAGE_FQ_NAME.child(Name.identifier("coroutineContext"))
 val COROUTINE_CONTEXT_FQ_NAME = DescriptorUtils.COROUTINES_PACKAGE_FQ_NAME.child(Name.identifier("coroutineContext"))
 
+fun FqName.isBuiltInCorouineContext() =
+    this == COROUTINE_CONTEXT_1_2_20_FQ_NAME || this == COROUTINE_CONTEXT_FQ_NAME
+
+fun FunctionDescriptor.isBuiltInCoroutineContext() =
+    (this as? PropertyGetterDescriptor)?.correspondingProperty?.fqNameSafe?.isBuiltInCorouineContext() == true
+
+fun PropertyDescriptor.isBuiltInCoroutineContext() = this.fqNameSafe.isBuiltInCorouineContext()
+
 object CoroutineSuspendCallChecker : CallChecker {
     private val ALLOWED_SCOPE_KINDS = setOf(LexicalScopeKind.FUNCTION_INNER_SCOPE, LexicalScopeKind.FUNCTION_HEADER_FOR_DESTRUCTURING)
 

idea/src/org/jetbrains/kotlin/idea/highlighter/KotlinSuspendCallLineMarkerProvider.kt

@@ -13,6 +13,7 @@ import com.intellij.openapi.editor.markup.GutterIconRenderer
 import com.intellij.openapi.progress.ProgressManager
 import com.intellij.psi.PsiElement
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
+import org.jetbrains.kotlin.descriptors.PropertyDescriptor
 import org.jetbrains.kotlin.descriptors.VariableDescriptorWithAccessors
 import org.jetbrains.kotlin.descriptors.accessors
 import org.jetbrains.kotlin.idea.KotlinIcons
@@ -22,6 +23,7 @@ import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.resolve.BindingContext
 import org.jetbrains.kotlin.resolve.BindingContext.*
 import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
+import org.jetbrains.kotlin.resolve.calls.checkers.isBuiltInCoroutineContext
 import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
 
 class KotlinSuspendCallLineMarkerProvider : LineMarkerProvider {
@@ -68,7 +70,7 @@ class KotlinSuspendCallLineMarkerProvider : LineMarkerProvider {
 }
 
 private fun KtExpression.isValidCandidateExpression(): Boolean {
-    if (this is KtOperationReferenceExpression || this is KtForExpression || this is KtProperty) return true
+    if (this is KtOperationReferenceExpression || this is KtForExpression || this is KtProperty || this is KtNameReferenceExpression) return true
     val parent = parent
     if (parent is KtCallExpression && parent.calleeExpression == this) return true
     return false
@@ -94,14 +96,14 @@ fun KtExpression.hasSuspendCalls(bindingContext: BindingContext = analyze(BodyRe
                     val delegatedFunctionDescriptor = bindingContext[DELEGATED_PROPERTY_RESOLVED_CALL, accessor]?.resultingDescriptor
                     delegatedFunctionDescriptor?.isSuspend == true
                 }
-            }
+            } else {
-            else {
                 false
             }
         }
         else -> {
             val resolvedCall = getResolvedCall(bindingContext)
-            (resolvedCall?.resultingDescriptor as? FunctionDescriptor)?.isSuspend == true
+            (resolvedCall?.resultingDescriptor as? FunctionDescriptor)?.isSuspend == true ||
+                    (resolvedCall?.resultingDescriptor as? PropertyDescriptor)?.isBuiltInCoroutineContext() == true
         }
     }
 }

idea/testData/inspectionsLocal/redundantSuspend/coroutineContext.kt

@@ -0,0 +1,8 @@
+// PROBLEM: none
+// WITH_RUNTIME
+
+import kotlin.coroutines.experimental.coroutineContext
+
+<caret>suspend fun test() {
+    coroutineContext
+}

idea/tests/org/jetbrains/kotlin/idea/inspections/LocalInspectionTestGenerated.java

@@ -2961,6 +2961,12 @@ public class LocalInspectionTestGenerated extends AbstractLocalInspectionTest {
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/inspectionsLocal/redundantSuspend"), Pattern.compile("^([\\w\\-_]+)\\.(kt|kts)$"), TargetBackend.ANY, true);
         }
 
+        @TestMetadata("coroutineContext.kt")
+        public void testCoroutineContext() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/inspectionsLocal/redundantSuspend/coroutineContext.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("getterDelegate.kt")
         public void testGetterDelegate() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/inspectionsLocal/redundantSuspend/getterDelegate.kt");

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/functions/factories/CoroutineContextFIF.kt

@@ -16,7 +16,6 @@
 
 package org.jetbrains.kotlin.js.translate.intrinsic.functions.factories
 
-import org.jetbrains.kotlin.backend.common.isBuiltInCoroutineContext
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.js.backend.ast.JsExpression
@@ -30,6 +29,7 @@ import org.jetbrains.kotlin.js.translate.utils.JsAstUtils
 import org.jetbrains.kotlin.js.translate.utils.TranslationUtils
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.resolve.DescriptorUtils
+import org.jetbrains.kotlin.resolve.calls.checkers.isBuiltInCoroutineContext
 import org.jetbrains.kotlin.resolve.inline.InlineStrategy
 
 object CoroutineContextFIF : FunctionIntrinsicFactory {