clang-1/test/Lexer/dollar-idents.c

// RUN: clang-cc -dump-tokens %s 2> %t
// RUN: grep "identifier '\$A'" %t
// RUN: clang-cc -dump-tokens -x assembler-with-cpp %s 2> %t
// RUN: grep "identifier 'A'" %t
// PR3808

$A