[PATCH] D36853: [Parser] Correct initalizer typos before lambda capture type is deduced.

[Volodymyr Sapsai via Phabricator via cfe-commits]

vsapsai created this revision.

This is the same assertion as in https://reviews.llvm.org/D25206 that is
triggered when RecordLayoutBuilder tries to compute the size of a field
(for capture "typo_boo" in the test case) whose type hasn't been
deduced.

The fix is to add CorrectDelayedTyposInExpr call to the case when we
aren't disambiguating between an Obj-C message send and a lambda
expression. Also added assertion to catch similar problems closer to
lambda parsing.

rdar://problem/31760839


https://reviews.llvm.org/D36853

Files:
  clang/lib/Parse/ParseExprCXX.cpp
  clang/lib/Sema/SemaLambda.cpp
  clang/test/SemaCXX/cxx1y-init-captures.cpp


Index: clang/test/SemaCXX/cxx1y-init-captures.cpp
===================================================================
--- clang/test/SemaCXX/cxx1y-init-captures.cpp
+++ clang/test/SemaCXX/cxx1y-init-captures.cpp
@@ -206,3 +206,10 @@
   find(weight); // expected-note {{in instantiation of function template specialization}}
 }
 }
+
+namespace init_capture_undeclared_identifier {
+  auto a = [x = y]{}; // expected-error{{use of undeclared identifier 'y'}}
+
+  int typo_foo; // expected-note {{'typo_foo' declared here}}
+  auto b = [x = typo_boo]{}; // expected-error{{use of undeclared identifier 'typo_boo'; did you mean 'typo_foo'}}
+}
Index: clang/lib/Sema/SemaLambda.cpp
===================================================================
--- clang/lib/Sema/SemaLambda.cpp
+++ clang/lib/Sema/SemaLambda.cpp
@@ -716,6 +716,8 @@
                                                     Expr *&Init) {
   // Create an 'auto' or 'auto&' TypeSourceInfo that we can use to
   // deduce against.
+  assert(!isa<TypoExpr>(Init) &&
+         "Typo correction should be done before type deduction");
   QualType DeductType = Context.getAutoDeductType();
   TypeLocBuilder TLB;
   TLB.pushTypeSpec(DeductType).setNameLoc(Loc);
Index: clang/lib/Parse/ParseExprCXX.cpp
===================================================================
--- clang/lib/Parse/ParseExprCXX.cpp
+++ clang/lib/Parse/ParseExprCXX.cpp
@@ -876,6 +876,8 @@
 
         if (!SkippedInits) {
           Init = ParseInitializer();
+          if (!Init.isInvalid())
+            Init = Actions.CorrectDelayedTyposInExpr(Init.get());
         } else if (Tok.is(tok::l_brace)) {
           BalancedDelimiterTracker Braces(*this, tok::l_brace);
           Braces.consumeOpen();


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