[CodeCompletion] Maintain LeaveClosureBodiesUnchecked when checking pattern binding

Before, we were dropping `LeaveClosureBodiesUnchecked` when checking a pattern binding request which caused missing completions inside variables initialized by closures.

rdar://92603748 [#58610]

Author: ahoppen

include/swift/AST/TypeCheckRequests.h

@@ -2264,7 +2264,7 @@ class ResultTypeRequest
 class PatternBindingEntryRequest
     : public SimpleRequest<PatternBindingEntryRequest,
                            const PatternBindingEntry *(PatternBindingDecl *,
-                                                       unsigned),
+                                                       unsigned, bool),
                            RequestFlags::SeparatelyCached> {
 public:
   using SimpleRequest::SimpleRequest;
@@ -2273,8 +2273,9 @@ class PatternBindingEntryRequest
   friend SimpleRequest;
 
   // Evaluation.
-  const PatternBindingEntry *
-  evaluate(Evaluator &evaluator, PatternBindingDecl *PBD, unsigned i) const;
+  const PatternBindingEntry *evaluate(Evaluator &evaluator,
+                                      PatternBindingDecl *PBD, unsigned i,
+                                      bool LeaveClosureBodiesUnchecked) const;
 
 public:
   // Separate caching.

include/swift/AST/TypeCheckerTypeIDZone.def

@@ -266,7 +266,7 @@ SWIFT_REQUEST(TypeChecker, OverriddenDeclsRequest,
               llvm::TinyPtrVector<ValueDecl *>(ValueDecl *), SeparatelyCached,
               NoLocationInfo)
 SWIFT_REQUEST(TypeChecker, PatternBindingEntryRequest,
-              const PatternBindingEntry *(PatternBindingDecl *, unsigned),
+              const PatternBindingEntry *(PatternBindingDecl *, unsigned, bool),
               SeparatelyCached, NoLocationInfo)
 SWIFT_REQUEST(TypeChecker, PrimarySourceFilesRequest,
               ArrayRef<SourceFile *>(ModuleDecl *), Cached, NoLocationInfo)

lib/AST/Decl.cpp

@@ -1957,7 +1957,8 @@ bool PatternBindingDecl::isComputingPatternBindingEntry(
     const VarDecl *vd) const {
   unsigned i = getPatternEntryIndexForVarDecl(vd);
   return getASTContext().evaluator.hasActiveRequest(
-      PatternBindingEntryRequest{const_cast<PatternBindingDecl *>(this), i});
+      PatternBindingEntryRequest{const_cast<PatternBindingDecl *>(this), i,
+                                 /*LeaveClosureBodyUnchecked=*/false});
 }
 
 bool PatternBindingDecl::isExplicitlyInitialized(unsigned i) const {

lib/Sema/TypeCheckDecl.cpp

@@ -2453,7 +2453,8 @@ NamingPatternRequest::evaluate(Evaluator &evaluator, VarDecl *VD) const {
     // and TypeCheckPattern handle the others. But that's all really gross.
     unsigned i = PBD->getPatternEntryIndexForVarDecl(VD);
     (void)evaluateOrDefault(evaluator,
-                            PatternBindingEntryRequest{PBD, i},
+                            PatternBindingEntryRequest{
+                                PBD, i, /*LeaveClosureBodiesUnchecked=*/false},
                             nullptr);
     if (PBD->isInvalid()) {
       VD->getParentPattern()->setType(ErrorType::get(Context));

lib/Sema/TypeCheckDeclPrimary.cpp

@@ -2023,7 +2023,9 @@ class DeclChecker : public DeclVisitor<DeclChecker> {
           PBD->isFullyValidated(i)
               ? &PBD->getPatternList()[i]
               : evaluateOrDefault(Ctx.evaluator,
-                                  PatternBindingEntryRequest{PBD, i}, nullptr);
+                                  PatternBindingEntryRequest{
+                                      PBD, i, LeaveClosureBodiesUnchecked},
+                                  nullptr);
       assert(entry && "No pattern binding entry?");
 
       const auto *Pat = PBD->getPattern(i);

lib/Sema/TypeCheckStorage.cpp

@@ -250,10 +250,9 @@ StoredPropertiesAndMissingMembersRequest::evaluate(Evaluator &evaluator,
 }
 
 /// Validate the \c entryNumber'th entry in \c binding.
-const PatternBindingEntry *
-PatternBindingEntryRequest::evaluate(Evaluator &eval,
-                                     PatternBindingDecl *binding,
-                                     unsigned entryNumber) const {
+const PatternBindingEntry *PatternBindingEntryRequest::evaluate(
+    Evaluator &eval, PatternBindingDecl *binding, unsigned entryNumber,
+    bool LeaveClosureBodiesUnchecked) const {
   const auto &pbe = binding->getPatternList()[entryNumber];
   auto &Context = binding->getASTContext();
 
@@ -363,8 +362,12 @@ PatternBindingEntryRequest::evaluate(Evaluator &eval,
   if (patternType->hasUnresolvedType() ||
       patternType->hasPlaceholder() ||
       patternType->hasUnboundGenericType()) {
-    if (TypeChecker::typeCheckPatternBinding(binding, entryNumber,
-                                             patternType)) {
+    TypeCheckExprOptions options;
+    if (LeaveClosureBodiesUnchecked) {
+      options |= TypeCheckExprFlags::LeaveClosureBodyUnchecked;
+    }
+    if (TypeChecker::typeCheckPatternBinding(binding, entryNumber, patternType,
+                                             options)) {
       binding->setInvalid();
       return &pbe;
     }

test/IDE/complete_in_closures.swift

@@ -396,3 +396,23 @@ func testSignature() {
 
     // NOTE: For effects specifiers completion (e.g. '() <HERE> -> Void') see test/IDE/complete_concurrency_specifier.swift
 }
+
+func testClosureInPatternBindingInit() {
+  enum DragState {
+    case dragging(translation: Int, predictedLocation: Int)
+  }
+
+  func pnChanged(_ action: () -> Void) {}
+
+  func foo() {
+    var gestureViewState: DragState = .dragging(translation: 0, predictedLocation: 0)
+    let longPressDrag = pnChanged {
+      _ = 1
+      gestureViewState = .dragging(translation: 0, #^CLOSURE_IN_PATTERN_BINDING^#predictedLocation: 0)
+    }
+  }
+  // CLOSURE_IN_PATTERN_BINDING: Begin completions, 1 items
+  // CLOSURE_IN_PATTERN_BINDING-DAG: Pattern/Local/Flair[ArgLabels]:     {#predictedLocation: Int#}[#Int#];
+  // CLOSURE_IN_PATTERN_BINDING: End completion
+
+}