+inference bugs

+List.ensureCapacity
optimized List.fill

lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt

@@ -3424,6 +3424,10 @@ class Compiler(
                     index < expectedParams.size
                 ) {
                     expectedParams[index]
+                } else if (param.type == TypeDecl.TypeAny && index == 0 && argsDeclaration.params.size == 1 &&
+                    implicitItType != null
+                ) {
+                    implicitItType
                 } else {
                     param.type
                 }

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

@@ -528,6 +528,22 @@ open class ObjList(initialList: MutableList<Obj> = mutableListOf()) : Obj() {
                 } else self.list.removeLast()
                 self
             }
+            addFnDoc(
+                name= "ensureCapacity",
+                doc = """
+                    ensure the list capacity allows storing specified amount if items without reallocation. 
+                    If current capacity is greater or equal to `count`, does nothing. Note that possible reallocation
+                    could be a costly operation,
+                """.trimIndent(),
+                params = listOf(ParamDoc("count", type("lyng.Int"))),
+                moduleName = "lyng.stdlib"
+            ) {
+                val self = thisAs<ObjList>()
+                val list = self.list as ArrayList
+                val count = requireOnlyArg<ObjInt>().value.toInt()
+                list.ensureCapacity(count)
+                self
+            }
 
             addFnDoc(
                 name = "removeRange",

lynglib/src/commonTest/kotlin/StdlibTest.kt

@@ -436,4 +436,12 @@ class StdlibTest {
             assertEquals(2, x)
         """.trimIndent())
     }
+
+    @Test
+    fun testListFill() = runTest {
+        eval("""
+            val x = List.fill(5) { i -> i * 10 }
+            assertEquals([0, 10, 20, 30, 40], x)
+        """.trimIndent())
+    }
 }