Improve error message for ObjList concatenation and set version to 1.1.0-SNAPSHOT.

lynglib/build.gradle.kts

@@ -21,7 +21,7 @@ import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 import org.jetbrains.kotlin.gradle.dsl.JvmTarget
 
 group = "net.sergeych"
-version = "1.1.0-beta2"
+version = "1.1.0-SNAPSHOT"
 
 // Removed legacy buildscript classpath declarations; plugins are applied via the plugins DSL below
 

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjList.kt

@@ -105,7 +105,7 @@ class ObjList(val list: MutableList<Obj> = mutableListOf()) : Obj() {
             }
 
             else ->
-                scope.raiseError("'+': can't concatenate $this with $other")
+                scope.raiseError("'+': can't concatenate ${this.toString(scope)} with ${other.toString(scope)}")
         }