cgen: fix double escaping \n in @VMOD_FILE expansion

vlib/v/gen/comptime.v

@@ -110,7 +110,7 @@ fn cgen_attrs(attrs []table.Attr) []string {
 
 fn (mut g Gen) comp_at(node ast.AtExpr) {
 	if node.kind == .vmod_file {
-		val := cnewlines(node.val.replace('\r', '')).replace('\\', '\\\\')
+		val := cnewlines(node.val.replace('\r', ''))
 		g.write('_SLIT("$val")')
 	} else {
 		val := node.val.replace('\\', '\\\\')

vlib/v/tests/vmod_parser_test.v

@@ -3,9 +3,7 @@ import os
 
 fn test_from_file() {
 	os.chdir(os.dir(os.getenv('VEXE')))
-	data := vmod.from_file('./v.mod') or {
-		panic(err)
-	}
+	data := vmod.from_file('./v.mod') or { panic(err) }
 	assert data.name == 'V'
 	assert data.description == 'The V programming language.'
 	assert data.version == '0.1.30'
@@ -42,3 +40,10 @@ fn test_decode() {
 		exit(0)
 	}
 }
+
+fn test_decode_with_comptime_vmod_file() {
+	mod := vmod.decode(@VMOD_FILE) or { panic('Error decoding v.mod') }
+	assert mod.name == 'V'
+	assert mod.repo_url == 'https://github.com/vlang/v'
+	assert mod.license == 'MIT'
+}