stdlib: Add also function

backend.native/tests/build.gradle

@@ -1516,6 +1516,10 @@ task main_exception(type: RunKonanTest) {
     source = "runtime/basic/main_exception.kt"
 }
 
+task runtime_basic_standard(type: RunKonanTest) {
+    source = "runtime/basic/standard.kt"
+}
+
 task runtime_basic_assert_failed(type: RunKonanTest) {
     expectedExitStatus = 1
     source = "runtime/basic/assert_failed.kt"

backend.native/tests/runtime/basic/standard.kt

@@ -0,0 +1,23 @@
+class Foo(val bar: Int)
+
+fun <T> assertEquals(actual: T, expected: T) {
+    if (actual != expected) throw AssertionError("Assertion failed. Expected value: $expected, actual value: $actual")
+}
+
+fun main(args: Array<String>) {
+    try {
+        TODO()
+        throw AssertionError("TODO() doesn't throw an exception")
+    } catch(e: NotImplementedError) {}
+
+    val foo = Foo(42)
+    assertEquals(run { 42 }, 42)
+    assertEquals(foo.run { bar }, 42)
+    assertEquals(with(foo) { bar }, 42)
+    assertEquals(foo.apply { bar }, foo)
+    assertEquals(foo.also { it.bar }, foo)
+    assertEquals(foo.let { it.bar }, 42)
+    var i = 0
+    repeat(10) { i++ }
+    assertEquals(i, 10)
+}

runtime/src/main/kotlin/kotlin/util/Standard.kt

@@ -61,6 +61,13 @@ public inline fun <T, R> with(receiver: T, block: T.() -> R): R = receiver.block
 @kotlin.internal.InlineOnly
 public inline fun <T> T.apply(block: T.() -> Unit): T { block(); return this }
 
+/**
+ * Calls the specified function [block] with `this` value as its argument and returns `this` value.
+ */
+@kotlin.internal.InlineOnly
+@SinceKotlin("1.1")
+public inline fun <T> T.also(block: (T) -> Unit): T { block(this); return this }
+
 /**
  * Calls the specified function [block] with `this` value as its argument and returns its result.
  */