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Merge pull requestRustPython#574 from RustPython/fetch_ins

fetch_instruction can just return a reference.

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Lines changed: 2 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -141,10 +141,8 @@ impl Frame {`
`141`	`141`	`value`
`142`	`142`	`}`
`143`	`143`
`144`		`-pubfnfetch_instruction(&self) -> bytecode::Instruction{`
`145`		`-// TODO: an immutable reference is enough, we should not`
`146`		`-// clone the instruction.`
`147`		`-let ins2 =self.code.instructions[*self.lasti.borrow()].clone();`
	`144`	`+pubfnfetch_instruction(&self) ->&bytecode::Instruction{`
	`145`	`+let ins2 =&self.code.instructions[*self.lasti.borrow()];`
`148`	`146`	`*self.lasti.borrow_mut() +=1;`
`149`	`147`	`ins2`
`150`	`148`	`}`

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