I had written some code for my library, arkley_algebra , around 3 weeks ago. It built successfully, ran without issues, and passed the tests. However, now it's not compiling, and I'm getting an error message that says: "the trait bound Number: Clone is not satisfied ." This is surprising because the trait bound for Clone is implemented using the derive attribute, and it had worked perfectly before without any changes to the code or modifications to the Rust tools version.
The specific error message is as follows:
error[E0277]: the trait bound `Number: Clone` is not satisfied
--> arkley_algebra\src\term.rs:21:5
|
18 | #[derive(Debug,PartialEq,Clone)]
| ----- in this derive macro
expansion
...
21 | coefficient: Number,
| ^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `Number`
|
= note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0277]: the trait bound `Number: Clone` is not satisfied
--> arkley_algebra\src\term.rs:24:5
|
18 | #[derive(Debug,PartialEq,Clone)]
| ----- in this derive macro
expansion
...
24 | variables: Variables,
| ^^^^^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `Number`
|
= note: required for `BTreeMap<char, Number>` to implement `Clone`
= note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
Here is the relevant code:
/// Represents a collection of variables, each associated with a numerical value.
/// The `Variables` type is an alias for `BTreeMap<char, Number>`.
pub type Variables = BTreeMap<char,Number>;
/// A struct representing a mathematical term.
///
/// A `Term` is a basic unit in a mathematical expression. It consists of a coefficient
/// (which can be any type that implements the `Numeric` trait) and variables represented
/// as `BTreeMap<char,Number>` .
#[derive(Debug,PartialEq,Clone)]
pub struct Term {
/// The coefficient of the term.
coefficient: Number,
/// The variables and their exponents in the term.
variables: Variables,
}
Where Number is defined as:
/// Represents a numeric value that can be decimal (aka f64) or Fraction or Standardform number
///
/// `Note` : add fractions variant to is as well
#[derive(Debug, PartialEq, Clone)]
pub enum Number {
/// Represents a floating-point decimal number.
Decimal(f64),
/// Represents a number in the StandardForm notation.
StandardForm(StandardForm),
}
/// Represents a number in standard form.
///
/// The `Standardform` struct holds the significand (mantissa) of the number
/// and an exponent that determines the power of 10 by which the significand should be multiplied.
#[derive(Debug,PartialEq,Clone)]
pub struct StandardForm {
mantissa : f64,
exponent : i8
}
I have even tried manually implementing the Clone trait for Number , like this:
impl Clone for Number {
fn clone(&self) -> Self {
match self {
Number::Decimal(d) => Number::Decimal(*d),
Number::StandardForm(sf) => Number::StandardForm(sf.clone()),
}
}
}
Despite this effort, I'm still encountering the same error. I'm puzzled because I don't have any other errors that might be interfering with the implementation of the Clone trait, such as macros.
Is there a specific reason for this issue, or is there a way to address and resolve it? I'm unsure of what could be causing this unexpected behavior.
,not yet I am using a local path until the library I'm working on works on a basic level so any local changes is updated correctly