[LLVMbugs] [Bug 20312] New: wrong tokenization around invalid UCNs

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20312

            Bug ID: 20312
           Summary: wrong tokenization around invalid UCNs
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: richard-llvm at metafoo.co.uk
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider:

  #define X(a) y##a
  #define yx Q(
  #define Q(x)
  X(x\u200e))

This code is ill-formed: it contains the identifier token 'x\u200e' which
contains the UCN '\u200e' which is not permitted in an identifier.

Clang treats this as two tokens instead, and as a result accepts the above
ill-formed code. This similar case is correctly rejected:

  X(x\u0065))

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