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error[E0019]: constant function contains unimplemented expression type
--> $DIR/const_let_assign3.rs:9:9
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LL | self.state = x;
| ^^^^^^^^^^^^^^
error[E0017]: references in constants may only refer to immutable values
--> $DIR/const_let_assign3.rs:16:5
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LL | s.foo(3); //~ ERROR references in constants may only refer to immutable values
| ^ constants require immutable values
error[E0017]: references in constants may only refer to immutable values
--> $DIR/const_let_assign3.rs:22:13
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LL | let y = &mut x;
| ^^^^^^ constants require immutable values
error[E0019]: constant contains unimplemented expression type
--> $DIR/const_let_assign3.rs:24:5
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LL | *y = 42;
| ^^^^^^^
error: aborting due to 4 previous errors
Some errors occurred: E0017, E0019.
For more information about an error, try `rustc --explain E0017`.
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