File: backtrack-off-by-one.cpp

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// RUN: %clang_cc1 -verify %s
// RUN: %clang_cc1 -verify %s -std=c++98
// RUN: %clang_cc1 -verify %s -std=c++11
// RUN: %clang_cc1 -verify %s -std=c++1z

// PR25946
// We had an off-by-one error in an assertion when annotating A<int> below.  Our
// error recovery checks if A<int> is a constructor declarator, and opens a
// TentativeParsingAction. Then we attempt to annotate the token at the exact
// position that we want to possibly backtrack to, and this used to crash.

template <typename T> class A {};

// expected-error@+1 {{expected '{' after base class list}}
template <typename T> class B : T // not ',' or '{'
#if __cplusplus < 201103L
// expected-error@+8 {{expected ';' after top level declarator}}
#endif
#if __cplusplus <= 201402L
// expected-error@+5 {{C++ requires a type specifier for all declarations}}
#else
// expected-error@+3 {{expected unqualified-id}}
#endif
// expected-error@+1 {{expected ';' after class}}
A<int> {
};