compiler/rustc_error_codes/src/error_codes/E0663.md


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#### Note: this error code is no longer emitted by the compiler.

An invalid input operand constraint was passed to the `llvm_asm` macro
(third line).

Erroneous code example:

```ignore (no longer emitted)
llvm_asm!("xor %eax, %eax"
          :
          : "+test"("a")
         );
```