29 lines
1.0 KiB
Rust
29 lines
1.0 KiB
Rust
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// edition: 2018
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// tests that the pointee type of a raw pointer must be known to call methods on it
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// see also: `tests/ui/editions/edition-raw-pointer-method-2018.rs`
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fn main() {
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let val = 1_u32;
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let ptr = &val as *const u32;
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unsafe {
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let _a: i32 = (ptr as *const _).read();
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//~^ ERROR cannot call a method on a raw pointer with an unknown pointee type [E0699]
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let b = ptr as *const _;
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let _b: u8 = b.read();
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//~^ ERROR cannot call a method on a raw pointer with an unknown pointee type [E0699]
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let _c = (ptr as *const u8).read(); // we know the type here
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}
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let mut val = 2_u32;
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let ptr = &mut val as *mut u32;
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unsafe {
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let _a: i32 = (ptr as *mut _).read();
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//~^ ERROR cannot call a method on a raw pointer with an unknown pointee type [E0699]
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let b = ptr as *mut _;
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b.write(10);
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//~^ ERROR cannot call a method on a raw pointer with an unknown pointee type [E0699]
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(ptr as *mut i32).write(1000); // we know the type here
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}
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}
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