Fix mem_categorization to treat an AutoObject adjustment as an rvalue.
Currently mem_categorization categorizes an AutoObject adjustment the same as the original expression. This can cause two moves to be generated for the same underlying expression. Currently this isn't a problem in practice, since check_loans doesn't rely on ExprUseVisitor.
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@ -390,12 +390,10 @@ impl<'t,TYPER:Typer> MemCategorizationContext<'t,TYPER> {
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Some(adjustment) => {
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match *adjustment {
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ty::AutoObject(..) => {
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// Implicity casts a concrete object to trait object
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// so just patch up the type
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// Implicity cast a concrete object to trait object.
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// Result is an rvalue.
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let expr_ty = if_ok!(self.expr_ty_adjusted(expr));
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let mut expr_cmt = (*if_ok!(self.cat_expr_unadjusted(expr))).clone();
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expr_cmt.ty = expr_ty;
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Ok(Rc::new(expr_cmt))
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Ok(self.cat_rvalue_node(expr.id(), expr.span(), expr_ty))
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}
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ty::AutoAddEnv(..) => {
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