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diff --git a/compiler/rustc_error_codes/src/error_codes/E0662.md b/compiler/rustc_error_codes/src/error_codes/E0662.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")
+         );
+```