Don't update mLastCursor for unexposed cursors (and other unknowns).

Otherwise the following example doesn't work:

struct crap
{
    ~crap()
    {}
};
struct fisk
{
struct C
{
    C(int) {}
    crap c;
};
};

int main(int argc, char **argv)
{
    fisk::C c = fisk::C(12);
    return 0;
}

struct crap
{
};
struct fisk
{
struct C
{
    C(int) {}
    crap c;
};
};

int main(int argc, char **argv)
{
    fisk::C c = fisk::C(12);
    return 0;
}

If crap has a destructor we get an unexposed expr between the callexpr
and the typeref and thus our callexpr constructor uglehack (see
ClangIndexer::indexVisitor) falls apart.

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 2.8.6)
 project(rtags)
 set(RTAGS_VERSION_MAJOR 2)
 set(RTAGS_VERSION_MINOR 5)
-set(RTAGS_VERSION_DATABASE 104)
+set(RTAGS_VERSION_DATABASE 105)
 set(RTAGS_VERSION_SOURCES_FILE 7)
 set(RTAGS_VERSION ${RTAGS_VERSION_MAJOR}.${RTAGS_VERSION_MINOR}.${RTAGS_VERSION_DATABASE})
 

src/ClangIndexer.cpp

@@ -673,10 +673,6 @@ CXChildVisitResult ClangIndexer::visitorHelper(CXCursor cursor, CXCursor, CXClie
 
 CXChildVisitResult ClangIndexer::indexVisitor(CXCursor cursor)
 {
-    struct UpdateLastCursor {
-        ~UpdateLastCursor() { func(); }
-        std::function<void()> func;
-    } call = { [this, cursor]() { mLastCursor = cursor; } };
     ++mCursorsVisited;
     // error() << "indexVisitor" << cursor;
     // FILE *f = fopen("/tmp/clangindex.log", "a");
@@ -692,6 +688,11 @@ CXChildVisitResult ClangIndexer::indexVisitor(CXCursor cursor)
         return CXChildVisit_Recurse;
     }
 
+    struct UpdateLastCursor {
+        ~UpdateLastCursor() { func(); }
+        std::function<void()> func;
+    } call = { [this, cursor]() { mLastCursor = cursor; } };
+
     bool blocked = false;
 
     Location loc = createLocation(cursor, &blocked);