https://issues.dlang.org/show_bug.cgi?id=17130
Issue ID: 17130 Summary: [Reg 2.074] ambiguous implicit super call when inheriting core.sync.mutex.Mutex Product: D Version: D2 Hardware: x86_64 OS: Linux Status: NEW Severity: enhancement Priority: P1 Component: druntime Assignee: nob...@puremagic.com Reporter: c...@dawg.eu cat > bug.d << CODE import core.sync.mutex : Mutex; class MyMutex : Mutex { } CODE dmd -c -o- bug ---- /home/dawg/Code/D/bug.d(3): Error: core.sync.mutex.Mutex.__ctor called with argument types () matches both: /home/dawg/dlang/dmd-master-2017-01-28/linux/bin64/../../src/druntime/import/core/sync/mutex.di(21): core.sync.mutex.Mutex.this() and: /home/dawg/dlang/dmd-master-2017-01-28/linux/bin64/../../src/druntime/import/core/sync/mutex.di(25): core.sync.mutex.Mutex.this() /home/dawg/Code/D/bug.d(3): Error: class bug.MyMutex cannot implicitly generate a default ctor when base class core.sync.mutex.Mutex is missing a default ctor ---- Introduced by https://github.com/dlang/druntime/issues/1728 or https://github.com/dlang/druntime/issues/1726. This is arguable a dmd bug, but it easily breaks any Mutex sub-class right now. --