LDC-E0104 — An escape the string does not define

What it means

Inside a quoted string, a backslash starts an escape: a short code for a character that is hard to type directly. Only the escapes the language defines are allowed. Any other letter after the backslash is not a character with a typo — it is a request the string cannot honor, and the string is rejected at that spot.

The fix is one character: replace the unknown escape with a defined one, or drop the backslash if a plain character was meant. The rest of the string stays untouched.

Example

Arxo Law

language "law.core" version "0.2";
package probe.e4 version "0.1.0";
namespace "urn:law:probe:\q";

Fix

Arxo Law

language "law.core" version "0.2";
package demo.diagnostics version "0.1.0";
namespace "urn:law:demo:diagnostics";

Engine message

The engine reports this in its own wording:

Output

example.law:3:26: error LDC-E0104: invalid escape sequence in string (§17)

Related

• LDC-E0102 — a string the reader cannot close.