E0080 rust const-eval ai_generated true

error[E0080]: constant evaluation error: division by zero

ID: rust/e0080-constant-evaluation-error-divide-by-zero

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95%Fix Rate
90%Confidence
1Evidence
2023-06-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.63.0 active — — —
1.66.0 active — — —
1.70.0 active — — —

Root Cause

A constant expression performs division or modulo by zero at compile time.

generic

中文

常量表达式在编译时执行了除以零或取模零的操作。

Official Documentation

https://doc.rust-lang.org/error_codes/E0080.html

Workarounds

  1. 95% success Ensure the divisor is non-zero by using a conditional: `const DIV: u32 = if DENOM != 0 { NUM / DENOM } else { 0 };` 
    Ensure the divisor is non-zero by using a conditional: `const DIV: u32 = if DENOM != 0 { NUM / DENOM } else { 0 };`
  2. 90% success Use checked arithmetic: `const RESULT: Option<u32> = NUM.checked_div(DENOM);` 
    Use checked arithmetic: `const RESULT: Option<u32> = NUM.checked_div(DENOM);`

中文步骤

  1. 通过条件确保除数非零：`const DIV: u32 = if DENOM != 0 { NUM / DENOM } else { 0 };`
  2. 使用检查算术：`const RESULT: Option<u32> = NUM.checked_div(DENOM);`

Dead Ends

Common approaches that don't work:

  1. Using `unsafe` to bypass the check in const context 100% fail

    `unsafe` is not allowed in const contexts; compiler rejects it.

  2. Changing the divisor to a variable to defer evaluation to runtime 70% fail

    If the divisor is still zero at runtime, it causes a panic; compile-time check is bypassed but runtime error remains.