01e83adc88
but a C-variadic method makes a trait dyn-incompatible. That is because methods from dyn traits, when cast to a function pointer, create a shim. That shim can't really forward the c-variadic arguments.
266 lines
9.0 KiB
Plaintext
266 lines
9.0 KiB
Plaintext
error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:6:19
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LL | fn f1_1(x: isize, ...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:9:9
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LL | fn f1_2(...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` is not supported for `extern "Rust"` functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:12:30
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LL | unsafe extern "Rust" fn f1_3(...) {}
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| ------------- ^^^
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| `extern "Rust"` because of this
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: functions with a C variable argument list must be unsafe
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--> $DIR/variadic-ffi-semantic-restrictions.rs:15:30
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LL | extern "C" fn f2_1(x: isize, ...) {}
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| ^^^
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help: add the `unsafe` keyword to this definition
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LL | unsafe extern "C" fn f2_1(x: isize, ...) {}
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| ++++++
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error: functions with a C variable argument list must be unsafe
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--> $DIR/variadic-ffi-semantic-restrictions.rs:18:20
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LL | extern "C" fn f2_2(...) {}
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| ^^^
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help: add the `unsafe` keyword to this definition
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LL | unsafe extern "C" fn f2_2(...) {}
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| ++++++
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:21:20
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LL | extern "C" fn f2_3(..., x: isize) {}
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| ^^^
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error: functions with a C variable argument list must be unsafe
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--> $DIR/variadic-ffi-semantic-restrictions.rs:24:30
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LL | extern "C" fn f3_1(x: isize, ...) {}
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| ^^^
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help: add the `unsafe` keyword to this definition
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LL | unsafe extern "C" fn f3_1(x: isize, ...) {}
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| ++++++
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error: functions with a C variable argument list must be unsafe
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--> $DIR/variadic-ffi-semantic-restrictions.rs:27:20
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LL | extern "C" fn f3_2(...) {}
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| ^^^
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help: add the `unsafe` keyword to this definition
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LL | unsafe extern "C" fn f3_2(...) {}
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| ++++++
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:30:20
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LL | extern "C" fn f3_3(..., x: isize) {}
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| ^^^
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error: functions cannot be both `const` and C-variadic
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--> $DIR/variadic-ffi-semantic-restrictions.rs:33:1
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LL | const unsafe extern "C" fn f4_1(x: isize, ...) {}
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| ^^^^^ `const` because of this ^^^ C-variadic because of this
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error: functions cannot be both `const` and C-variadic
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--> $DIR/variadic-ffi-semantic-restrictions.rs:37:1
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LL | const extern "C" fn f4_2(x: isize, ...) {}
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| ^^^^^ `const` because of this ^^^ C-variadic because of this
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error: functions with a C variable argument list must be unsafe
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--> $DIR/variadic-ffi-semantic-restrictions.rs:37:36
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LL | const extern "C" fn f4_2(x: isize, ...) {}
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| ^^^
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help: add the `unsafe` keyword to this definition
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LL | const unsafe extern "C" fn f4_2(x: isize, ...) {}
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| ++++++
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:42:26
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LL | const extern "C" fn f4_3(..., x: isize, ...) {}
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| ^^^
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error: functions cannot be both `const` and C-variadic
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--> $DIR/variadic-ffi-semantic-restrictions.rs:42:1
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LL | const extern "C" fn f4_3(..., x: isize, ...) {}
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| ^^^^^ `const` because of this ^^^ C-variadic because of this
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error: functions with a C variable argument list must be unsafe
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--> $DIR/variadic-ffi-semantic-restrictions.rs:42:41
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LL | const extern "C" fn f4_3(..., x: isize, ...) {}
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| ^^^
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help: add the `unsafe` keyword to this definition
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LL | const unsafe extern "C" fn f4_3(..., x: isize, ...) {}
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| ++++++
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:48:13
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LL | fn e_f2(..., x: isize);
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| ^^^
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:55:23
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LL | fn i_f1(x: isize, ...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:57:13
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LL | fn i_f2(...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:59:13
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LL | fn i_f3(..., x: isize, ...) {}
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| ^^^
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:59:28
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LL | fn i_f3(..., x: isize, ...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:62:13
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LL | fn i_f4(..., x: isize, ...) {}
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| ^^^
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:62:28
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LL | fn i_f4(..., x: isize, ...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: functions cannot be both `const` and C-variadic
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--> $DIR/variadic-ffi-semantic-restrictions.rs:65:5
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LL | const fn i_f5(x: isize, ...) {}
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| ^^^^^ ^^^ C-variadic because of this
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| `const` because of this
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:65:29
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LL | const fn i_f5(x: isize, ...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:72:23
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LL | fn t_f1(x: isize, ...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:74:23
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LL | fn t_f2(x: isize, ...);
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:76:13
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LL | fn t_f3(...) {}
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` is not supported for non-extern functions
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--> $DIR/variadic-ffi-semantic-restrictions.rs:78:13
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LL | fn t_f4(...);
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| ^^^
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= help: only `extern "C"` and `extern "C-unwind"` functions may have a C variable argument list
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:80:13
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LL | fn t_f5(..., x: isize) {}
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| ^^^
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error: `...` must be the last argument of a C-variadic function
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--> $DIR/variadic-ffi-semantic-restrictions.rs:82:13
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LL | fn t_f6(..., x: isize);
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| ^^^
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error[E0493]: destructor of `VaListImpl<'_>` cannot be evaluated at compile-time
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--> $DIR/variadic-ffi-semantic-restrictions.rs:33:43
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LL | const unsafe extern "C" fn f4_1(x: isize, ...) {}
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| ^^^ - value is dropped here
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| the destructor for this type cannot be evaluated in constant functions
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error[E0493]: destructor of `VaListImpl<'_>` cannot be evaluated at compile-time
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--> $DIR/variadic-ffi-semantic-restrictions.rs:37:36
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LL | const extern "C" fn f4_2(x: isize, ...) {}
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| ^^^ - value is dropped here
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| the destructor for this type cannot be evaluated in constant functions
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error[E0493]: destructor of `VaListImpl<'_>` cannot be evaluated at compile-time
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--> $DIR/variadic-ffi-semantic-restrictions.rs:65:29
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LL | const fn i_f5(x: isize, ...) {}
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| ^^^ - value is dropped here
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| the destructor for this type cannot be evaluated in constant functions
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error: aborting due to 33 previous errors
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For more information about this error, try `rustc --explain E0493`.
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