[Bug translator/16165] New: @perf operator in error msgs is corrupted

["jlebon at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16165

            Bug ID: 16165
           Summary: @perf operator in error msgs is corrupted
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: jlebon at redhat dot com

The following command:

$ stap -e '
global x

probe perf.hw.cpu_cycles.process("/home/yyz/jlebon/towers.x").counter("a") {} 

probe process("/home/yyz/jlebon/towers.x").function("main")
{
   # wrong type
   x = "b" . @perf("a")
}
'

gives as semantic error this:

semantic error: type mismatch: expected string but found long: identifier 'a'
at /home/yyz/jlebon/perf.stp:8:14
        source:    x = "b" . aperf("a")
                             ^

Pass 2: analysis failed.  [man error::pass2]

Notice the corruption from '@' to 'a'.

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