// RUN: rm -rf %t
// RUN: mkdir -p %t
// RUN: cp %s %t/main.swift
// RUN: %target-build-swift -Xfrontend -playground -Xfrontend -debugger-support -o %t/main %S/Inputs/PlaygroundsRuntime.swift %t/main.swift
// RUN: %target-run %t/main | %FileCheck %s
// RUN: %target-build-swift -Xfrontend -pc-macro -Xfrontend -playground -Xfrontend -debugger-support -o %t/main %S/Inputs/PlaygroundsRuntime.swift %S/Inputs/SilentPCMacroRuntime.swift %t/main.swift
// RUN: %target-run %t/main | %FileCheck %s
// REQUIRES: executable_test

var a = "a"
var b = "b" 
a += b 
// CHECK: [{{.*}}] $builtin_log[a='a']
// CHECK-NEXT: [{{.*}}] $builtin_log[b='b']
// CHECK-NEXT: [{{.*}}] $builtin_log[a='ab']