efriedma added inline comments.
================
Comment at: include/clang/AST/Expr.h:1728
+ UnaryOperator(Expr *input, Opcode opc, QualType type, ExprValueKind VK,
+ ExprObjectKind OK, SourceLocation l, bool CanOverflow = false)
+ : Expr(UnaryOperatorClass, type, VK, OK,
----------------
Is the default argument necessary here? Better to avoid when possible.
================
Comment at: lib/Sema/SemaExpr.cpp:12212
case UO_Minus:
+ CanOverflow = isOverflowingIntegerType(Context, Input.get()->getType());
Input = UsualUnaryConversions(Input.get());
----------------
UO_Plus can't overflow.
================
Comment at: test/Misc/ast-dump-stmt.c:66
+ // CHECK: ImplicitCastExpr
+ // CHECK: DeclRefExpr{{.*}}'T2' 'int'
+}
----------------
What does it mean for bitwise complement to "overflow"?
https://reviews.llvm.org/D33563
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