u8 and u16 support in struct

[sagudev]

I have struct that has one field with u8.

pub struct _AudioInfo {
    /// Number of channels
    pub channels: u32,
    /// sampling rate in hz
    pub sample_rate: u32,
    /// len in s
    pub len: u64,
    /// bit 16 or 24 bit
    pub bits: u8,
}

The generated code is not working as apparently into_dart is not impl for u8. Changing to u16 also gives same error, but changing to u32 or u64 makes it go away. Is this a bug or a feature/known limitation?

error[E0599]: the method `into_dart` exists for type `u8`, but its trait bounds were not satisfied
   --> src/bridge_generated.rs:360:25
    |
360 |             self.0.bits.into_dart(),
    |                         ^^^^^^^^^ method cannot be called on `u8` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `u8: Into<DartCObject>`
            which is required by `u8: IntoDart`
            `&u8: Into<DartCObject>`
            which is required by `&u8: IntoDart`
            `&mut u8: Into<DartCObject>`
            which is required by `&mut u8: IntoDart`

For more information about this error, try `rustc --explain E0599`.
warning: `native` (lib) generated 1 warning
error: could not compile `native` due to previous error; 1 warning emitted

[fzyzcjy]

Sounds like a bug? What about making it an issue

Btw same issue here:

It is workable, but I cannot parse dart Int into rust with type u8 or u16 (but ok with u32 and u64, but according to section3.1, it should be convertable with u8) for rust---It can not be compiled finally.

#421 (comment)

@dbsxdbsx

[sagudev]

Just made a testcase here: https://github.com/sagudev/u8u16.
struct:

pub struct Test {
    pub uu8: u8,
    pub uu16: u16,
    pub uu32: u32,
    pub uu64: u64,
    pub ii8: i8,
    pub ii16: i16,
    pub ii32: i32,
    pub ii64: i64,
}

errors:

error[E0599]: the method `into_dart` exists for type `u8`, but its trait bounds were not satisfied
   --> src/bridge_generated.rs:116:22
    |
116 |             self.uu8.into_dart(),
    |                      ^^^^^^^^^ method cannot be called on `u8` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `u8: Into<DartCObject>`
            which is required by `u8: IntoDart`
            `&u8: Into<DartCObject>`
            which is required by `&u8: IntoDart`
            `&mut u8: Into<DartCObject>`
            which is required by `&mut u8: IntoDart`

error[E0599]: the method `into_dart` exists for type `u16`, but its trait bounds were not satisfied
   --> src/bridge_generated.rs:117:23
    |
117 |             self.uu16.into_dart(),
    |                       ^^^^^^^^^ method cannot be called on `u16` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `u16: Into<DartCObject>`
            which is required by `u16: IntoDart`
            `&u16: Into<DartCObject>`
            which is required by `&u16: IntoDart`
            `&mut u16: Into<DartCObject>`
            which is required by `&mut u16: IntoDart`

error[E0599]: the method `into_dart` exists for type `i8`, but its trait bounds were not satisfied
   --> src/bridge_generated.rs:120:22
    |
120 |             self.ii8.into_dart(),
    |                      ^^^^^^^^^ method cannot be called on `i8` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `i8: Into<DartCObject>`
            which is required by `i8: IntoDart`
            `&i8: Into<DartCObject>`
            which is required by `&i8: IntoDart`
            `&mut i8: Into<DartCObject>`
            which is required by `&mut i8: IntoDart`

error[E0599]: the method `into_dart` exists for type `i16`, but its trait bounds were not satisfied
   --> src/bridge_generated.rs:121:23
    |
121 |             self.ii16.into_dart(),
    |                       ^^^^^^^^^ method cannot be called on `i16` due to unsatisfied trait bounds
    |
    = note: the following trait bounds were not satisfied:
            `i16: Into<DartCObject>`
            which is required by `i16: IntoDart`
            `&i16: Into<DartCObject>`
            which is required by `&i16: IntoDart`
            `&mut i16: Into<DartCObject>`
            which is required by `&mut i16: IntoDart`

For more information about this error, try `rustc --explain E0599`.
error: could not compile `native` due to 4 previous errors
Building Linux application...                                           
Exception: Build process failed

[sagudev]

Issue here: #429

[dbsxdbsx]

Yes, @fzyzcjy, indeed, as @sagudev said, if I made a rust function with u8 oru16, the generated rust code cannot be even compiled, u32 u64 and u128 is ok--- I didn't treat it as bug before you mentioned it here.

I tested on win10 for targeting windows app.