fix possible string error on inlined subroutines

codeOptimizers/src/prog8/optimizer/UnusedCodeRemover.kt

@@ -100,7 +100,9 @@ class UnusedCodeRemover(private val program: Program,
                 if(!subroutine.definingModule.isLibrary && !subroutine.hasBeenInlined) {
                     errors.warn("unused subroutine '${subroutine.name}'", subroutine.position)
                 }
-                program.removeInternedStringsFromRemovedSubroutine(subroutine)
+                if(!subroutine.inline) {
+                    program.removeInternedStringsFromRemovedSubroutine(subroutine)
+                }
                 return listOf(IAstModification.Remove(subroutine, parent as IStatementContainer))
             }
         }

compiler/test/TestOptimization.kt

@@ -764,6 +764,20 @@ main {
 	sub start() {
 	    sort(cards)
 	}
+}"""
+        compileText(C64Target(), true, text, writeAssembly = false) shouldNotBe null
+    }
+
+    test("no string error when inlining") {
+        val text="""
+main {
+    sub start() {
+        test()
+    }
+
+    sub test() {
+        cx16.r0 = "abc"
+    }
 }"""
         compileText(C64Target(), true, text, writeAssembly = false) shouldNotBe null
     }