Refine op-assignment.
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@@ -387,7 +387,7 @@ fn optimize_stmt(stmt: &mut Stmt, state: &mut State, preserve_result: bool) {
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if x.1.is_none()
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&& x.0.is_variable_access(true)
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&& matches!(&x.2, Expr::FnCall(x2, _)
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if Token::lookup_from_syntax(&x2.name).and_then(|t| t.make_op_assignment()).is_some()
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if Token::lookup_from_syntax(&x2.name).map(|t| t.has_op_assignment()).unwrap_or(false)
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&& x2.args_count() == 2 && x2.args.len() >= 1
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&& x2.args[0].get_variable_name(true) == x.0.get_variable_name(true)
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) =>
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@@ -397,7 +397,7 @@ fn optimize_stmt(stmt: &mut Stmt, state: &mut State, preserve_result: bool) {
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state.set_dirty();
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let op = Token::lookup_from_syntax(&x2.name).unwrap();
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let op_assignment = op.make_op_assignment().unwrap();
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x.1 = Some(OpAssignment::new(op_assignment.keyword_syntax()));
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x.1 = Some(OpAssignment::new(op_assignment));
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x.2 = if x2.args.len() > 1 {
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mem::take(&mut x2.args[1])
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} else {
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