digitalmars.D.bugs - [Issue 20954] New: spawn in unitest: compiler error, confusing message
- d-bugmail puremagic.com (43/43) Jun 18 2020 https://issues.dlang.org/show_bug.cgi?id=20954
https://issues.dlang.org/show_bug.cgi?id=20954 Issue ID: 20954 Summary: spawn in unitest: compiler error, confusing message Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: normal Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: mingwu gmail.com Created attachment 1794 --> https://issues.dlang.org/attachment.cgi?id=1794&action=edit spawn in unitest: compiler error, confusing message put the code from: https://tour.dlang.org/tour/en/multithreading/synchronization-sharing in file, and put unittest block from safePrint() to main() as here: https://github.com/mingwugmail/dlang_tour/blob/master/spawn_in_unittest.d#L33 $ dmd -unittest spawn_in_unittest.d spawn_in_unittest.d(87): Error: template std.concurrency.spawn cannot deduce function from argument types !()(void delegate(shared(SafeQueue!int) queue, shared(int)* queueCounter) system, shared(SafeQueue!int), shared(int)*), candidates are: /usr/include/dmd/phobos/std/concurrency.d(460): spawn(F, T...)(F fn, T args) with F = void delegate(shared(SafeQueue!int), shared(int)*) system, T = (shared(SafeQueue!int), shared(int)*) must satisfy the following constraint: isSpawnable!(F, T) spawn_in_unittest.d(88): Error: template std.concurrency.spawn cannot deduce function from argument types !()(void delegate(Tid owner, shared(SafeQueue!int) queue, shared(int)* queueCounter) system, Tid, shared(SafeQueue!int), shared(int)*), candidates are: /usr/include/dmd/phobos/std/concurrency.d(460): spawn(F, T...)(F fn, T args) with F = void delegate(Tid, shared(SafeQueue!int), shared(int)*) system, T = (Tid, shared(SafeQueue!int), shared(int)*) must satisfy the following constraint: isSpawnable!(F, T) --
Jun 18 2020