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error: constant evaluation is taking a long time
--> $DIR/ctfe-fn-call.rs:28:5
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LL | foo();
| ^^^^^
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= note: this lint makes sure the compiler doesn't get stuck due to infinite loops in const eval.
If your compilation actually takes a long time, you can safely allow the lint.
help: the constant being evaluated
--> $DIR/ctfe-fn-call.rs:32:1
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LL | const X: u32 = call_foo();
| ^^^^^^^^^^^^
= note: `#[deny(long_running_const_eval)]` on by default
error: aborting due to 1 previous error
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