FIx ICE while casting a type with error · rust-lang/rust@fb619ec (original) (raw)
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error[E0261]: use of undeclared lifetime name 'unpinned
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--> $DIR/ice-cast-type-with-error-124848.rs:7:32
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LL | struct MyType<'a>(Cell<Option<&'unpinned mut MyType<'a>>>, Pin);
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| - ^^^^^^^^^ undeclared lifetime
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| |
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| help: consider introducing lifetime 'unpinned here: 'unpinned,
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error[E0261]: use of undeclared lifetime name 'a
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--> $DIR/ice-cast-type-with-error-124848.rs:14:53
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LL | fn main() {
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| - help: consider introducing lifetime 'a here: <'a>
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...
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LL | let bad_addr = &unpinned as *const Cell<Option<&'a mut MyType<'a>>> as usize;
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| ^^ undeclared lifetime
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error[E0261]: use of undeclared lifetime name 'a
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--> $DIR/ice-cast-type-with-error-124848.rs:14:67
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LL | fn main() {
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| - help: consider introducing lifetime 'a here: <'a>
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...
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LL | let bad_addr = &unpinned as *const Cell<Option<&'a mut MyType<'a>>> as usize;
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| ^^ undeclared lifetime
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error[E0412]: cannot find type Pin in this scope
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--> $DIR/ice-cast-type-with-error-124848.rs:7:60
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LL | struct MyType<'a>(Cell<Option<&'unpinned mut MyType<'a>>>, Pin);
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| ^^^ not found in this scope
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help: consider importing this struct
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LL + use std::pin::Pin;
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error[E0061]: this struct takes 2 arguments but 1 argument was supplied
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--> $DIR/ice-cast-type-with-error-124848.rs:12:24
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LL | let mut unpinned = MyType(Cell::new(None));
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| ^^^^^^----------------- an argument is missing
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note: tuple struct defined here
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--> $DIR/ice-cast-type-with-error-124848.rs:7:8
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LL | struct MyType<'a>(Cell<Option<&'unpinned mut MyType<'a>>>, Pin);
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| ^^^^^^
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help: provide the argument
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LL | let mut unpinned = MyType(Cell::new(None), /* value */);
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| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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error[E0606]: casting &MyType<'_> as *const Cell<Option<&mut MyType<'_>>> is invalid
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--> $DIR/ice-cast-type-with-error-124848.rs:14:20
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LL | let bad_addr = &unpinned as *const Cell<Option<&'a mut MyType<'a>>> as usize;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: aborting due to 6 previous errors
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Some errors have detailed explanations: E0061, E0261, E0412, E0606.
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For more information about an error, try rustc --explain E0061.
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