Merge pull request swiftlang#31365 from nathawes/fix-assertion-hit-in-getUnwrappedCurryThunkExpr-5.3

[5.3][AST] Fix assertion hit in AutoClosureExpr::getUnwrappedCurryThunkExpr()

Author: akyrtzi

lib/AST/Expr.cpp

@@ -1897,6 +1897,8 @@ Expr *AutoClosureExpr::getUnwrappedCurryThunkExpr() const {
 
       if (auto *openExistential = dyn_cast<OpenExistentialExpr>(innerBody)) {
         innerBody = openExistential->getSubExpr();
+        if (auto *ICE = dyn_cast<ImplicitConversionExpr>(innerBody))
+          innerBody = ICE->getSyntacticSubExpr();
       }
 
       if (auto *outerCall = dyn_cast<ApplyExpr>(innerBody)) {

test/Index/roles.swift

@@ -520,3 +520,14 @@ func useDefaultInits() {
   // CHECK: [[@LINE-1]]:15 | instance-property/Swift | y | s:14swift_ide_test7BStructV1ySbvp | Ref,RelCont
   // CHECK: [[@LINE-2]]:7 | constructor/Swift | init(x:y:z:) | s:14swift_ide_test7BStructV1x1y1zACSi_SbSStcfc | Ref,Call,RelCall,RelCont | rel: 1
 }
+
+internal protocol FromInt {
+    init(_ uint64: Int)
+}
+extension Int: FromInt { }
+func test<M>(_: M, value: Int?) {
+    if let idType = M.self as? FromInt.Type {
+        _ = value.flatMap(idType.init) as? M
+// CHECK: [[@LINE-1]]:34 | constructor/Swift | init(_:) | s:14swift_ide_test7FromIntPyxSicfc | Ref,RelCont | rel: 1
+    }
+}