E0502E0502 — Cannot Borrow as Mutable Because Also Borrowed as Immutable
A value cannot be mutably borrowed while an immutable borrow is still active.
panic-divide-by-zeroThe program panicked because of an integer division by zero.
An integer division or modulo operation has a divisor of zero. Rust checks for this at runtime and panics. Floating-point division by zero produces infinity, not a panic.
Check the divisor before dividing. Use checked_div() which returns None instead of panicking. Validate input values that could be zero.
E0502A value cannot be mutably borrowed while an immutable borrow is still active.
E0271An associated type in a trait implementation does not match the expected type.
E0308The expected type does not match the actual type provided.
E0277A type does not implement a required trait.
E0053The method signature in an impl block does not match the trait's method signature.
E0621A function parameter needs an explicit lifetime annotation to satisfy the borrow checker.