Bug 18277 – synchronized statement with comma operator ignores first arguments

According to TDPL[1], synchronized (a, b) should should lock both a and b. This does not happen: import std.stdio; import core.thread; class C {} class MyThread1 : Thread { C c, d; this(C c, C d) { this.c = c; this.d = d; super(&run); } void run() { synchronized(c, d) { writeln("Thread sleeping..."); Thread.sleep(5.dur!"seconds"); writeln("Thread woke up"); } } } unittest { C c = new C; C d = new C; auto derived = new MyThread1(c, d).start(); Thread.sleep(2.dur!"seconds"); synchronized(c) { writeln("c is not synchronized"); } synchronized(d) { writeln("d is synchronized"); } } Expected output: Thread sleeping... Thread woke up c is not synchronized d is synchronized Actual output: Thread sleeping... c is not synchronized Thread woke up d is synchronized [1]: http://www.informit.com/articles/article.aspx?p=1609144&seqNum=15

*** This issue has been marked as a duplicate of issue 16057 ***