Add no_position feature.

tests/maps.rs

@@ -206,7 +206,7 @@ fn test_map_json() -> Result<(), Box<EvalAltResult>> {
     assert!(matches!(
         *engine.parse_json("   123", true).expect_err("should error"),
         EvalAltResult::ErrorParsing(ParseErrorType::MissingToken(token, _), pos)
-            if token == "{" && pos.position() == Some(4)
+            if token == "{"
     ));
 
     Ok(())

tests/optimizer.rs

@@ -49,6 +49,7 @@ fn test_optimizer_run() -> Result<(), Box<EvalAltResult>> {
 }
 
 #[cfg(not(feature = "no_module"))]
+#[cfg(not(feature = "no_position"))]
 #[test]
 fn test_optimizer_parse() -> Result<(), Box<EvalAltResult>> {
     let mut engine = Engine::new();

tests/print.rs

@@ -60,7 +60,11 @@ fn test_print_debug() -> Result<(), Box<EvalAltResult>> {
     assert_eq!(logbook.read().unwrap()[0], "entry: 42");
     assert_eq!(
         logbook.read().unwrap()[1],
-        r#"DEBUG of world at 1:19: "hello!""#
+        if cfg!(not(feature = "no_position")) {
+            r#"DEBUG of world at 1:19: "hello!""#
+        } else {
+            r#"DEBUG of world at none: "hello!""#
+        }
     );
 
     for entry in logbook.read().unwrap().iter() {

tests/string.rs

@@ -14,7 +14,11 @@ fn test_string() -> Result<(), Box<EvalAltResult>> {
     );
     assert_eq!(
         engine.eval::<String>("   \"Test string: \\u2764\\\n     hello, world!\"")?,
-        "Test string: ❤ hello, world!"
+        if cfg!(not(feature = "no_position")) {
+            "Test string: ❤ hello, world!"
+        } else {
+            "Test string: ❤     hello, world!"
+        }
     );
     assert_eq!(
         engine.eval::<String>("     `Test string: \\u2764\nhello,\\nworld!`")?,