[Issue 20093] New: Error: cannot form tuple of tuples

d-bugmail at puremagic.com d-bugmail at puremagic.com
Wed Jul 31 22:53:06 UTC 2019


          Issue ID: 20093
           Summary: Error: cannot form tuple of tuples
           Product: D
           Version: D2
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: destructionator at gmail.com

mixin template MakeProperty(Attributes...) {
        @(Attributes) void bug() {}

struct Attr { }

struct Test {
        mixin MakeProperty!(Attr);

void main() {
        pragma(msg, __traits(getAttributes, Test.bug).stringof);


Interestingly, it compiles fine if you do not try to actually getAttributes;
comment out that pragma line in main and it works just fine.

It also works if you pass a value to MakeProperty; only a type like in the
example triggers the problem.

In dmd, the comment says "Assume exps[] is already tuple expanded." so I'm
guessing some semantic() pass wasn't run in the right place for this.


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