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Allow chaining prefix expressions.

--- a/parse/gram.y

+++ b/parse/gram.y

@@ -445,14 +445,14 @@

 shiftop : Tbsl | Tbsr;

 prefixexpr

-        : Tinc postfixexpr      {$$ = mkexpr($1->line, Opreinc, $2, NULL);}

-        | Tdec postfixexpr      {$$ = mkexpr($1->line, Opredec, $2, NULL);}

-        | Tstar postfixexpr     {$$ = mkexpr($1->line, Oderef, $2, NULL);}

-        | Tband postfixexpr     {$$ = mkexpr($1->line, Oaddr, $2, NULL);}

-        | Tlnot postfixexpr     {$$ = mkexpr($1->line, Olnot, $2, NULL);}

-        | Tbnot postfixexpr     {$$ = mkexpr($1->line, Obnot, $2, NULL);}

-        | Tminus postfixexpr    {$$ = mkexpr($1->line, Oneg, $2, NULL);}

-        | Tplus postfixexpr     {$$ = $2;} /* positive is a nop */

+        : Tinc prefixexpr      {$$ = mkexpr($1->line, Opreinc, $2, NULL);}

+        | Tdec prefixexpr      {$$ = mkexpr($1->line, Opredec, $2, NULL);}

+        | Tstar prefixexpr     {$$ = mkexpr($1->line, Oderef, $2, NULL);}

+        | Tband prefixexpr     {$$ = mkexpr($1->line, Oaddr, $2, NULL);}

+        | Tlnot prefixexpr     {$$ = mkexpr($1->line, Olnot, $2, NULL);}

+        | Tbnot prefixexpr     {$$ = mkexpr($1->line, Obnot, $2, NULL);}

+        | Tminus prefixexpr    {$$ = mkexpr($1->line, Oneg, $2, NULL);}

+        | Tplus prefixexpr     {$$ = $2;} /* positive is a nop */

         | postfixexpr

         ;

-- 

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