[Bug translator/20389] New: warn on $var.field when $var->field correct

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

https://sourceware.org/bugzilla/show_bug.cgi?id=20389

            Bug ID: 20389
           Summary: warn on  $var.field   when $var->field correct
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: fche at redhat dot com
  Target Milestone: ---

I could've sworn we already have a warning for this, but can't find it:
e.g.:

stap -p4 -e ' probe kernel.function("__d_drop") { x=$dentry->d_lockref.count
println(x) }'
WARNING: never-assigned local variable 'count' (similar: x): identifier 'count'
at <input>:1:59
 source:  probe kernel.function("__d_drop") { x=$dentry->d_lockref.count
println(x) }
                                                                   ^
semantic error: while processing probe
kernel.function("__d_drop@fs/dcache.c:468") from: kernel.function("__d_drop")

semantic error: 'struct lockref' is being accessed instead of a member:
identifier '$dentry' at :1:40
        source:  probe kernel.function("__d_drop") { x=$dentry->d_lockref.count
println(x) }

instead of something saying that the '.' should have been a '->'.

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