http://d.puremagic.com/issues/show_bug.cgi?id=7169

           Summary: [CTFE] Assertion failure with inner struct
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: youxkei@gmail.com


--- Comment #0 from Hisayuki Mima <youxkei@gmail.com> 2011-12-27 18:29:01 JST ---
struct Struct(T){
    T t;
}

void func(T)(T t){
    Struct!T s;
    s.t = t;
}

static assert({
    struct InnerStruct{
        void func(){}
    }
    func(InnerStruct());
    return true;
}());

void main(){}


This code doesn't work.

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
                 CC|                            |clugdbug@yahoo.com.au


--- Comment #1 from Don <clugdbug@yahoo.com.au> 2012-01-01 11:43:28 PST ---
According to the spec, I don't think this is supposed to work. expression.html says:
----
Nested structs cannot be used as fields or as the element type of an array:

void foo() {
  int i = 7;
  struct SS {
    int x,y;
    int bar() { return x + i + 1; }
  }
  struct DD {
    SS s;  // error, cannot be field
  }
}
----
So creating such a struct by passing the nested struct as a template parameter shouldn't work either. But, the compiler accepts the examples that the spec says are errors. So I'm not sure if the bug is in the spec or the compiler.


The ICE is a variation of bug 6419, but where the nested struct is part of a struct literal. Here's a test case with the same ICE, but this time where it's part of an array.

void func2(T)(T t){
    T[2] s;
    s[0] = t;
}

static assert({
    struct InnerStruct{
        void func(){}
    }
    func2(InnerStruct());
    return true;
}());

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--- Comment #2 from Walter Bright <bugzilla@digitalmars.com> 2013-10-05 22:53:15 PDT ---
(In reply to comment #0)
> struct Struct(T){
>     T t;
> }
> 
> void func(T)(T t){
>     Struct!T s;
>     s.t = t;
> }
> 
> static assert({
>     struct InnerStruct{
>         void func(){}
>     }
>     func(InnerStruct());
>     return true;
> }());
> 
> void main(){}
> 
> 
> This code doesn't work.

It produces a correct error message:

test.d(6): Error: delegate test.__lambda4 is a nested function and cannot be
accessed from test.func!(InnerStruct).func

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #3 from Walter Bright <bugzilla@digitalmars.com> 2013-10-05 22:55:34 PDT ---
(In reply to comment #1)
> According to the spec, I don't think this is supposed to work.

It's not.

> void func2(T)(T t){
>     T[2] s;
>     s[0] = t;
> }
> 
> static assert({
>     struct InnerStruct{
>         void func(){}
>     }
>     func2(InnerStruct());
>     return true;
> }());

This also produces a correct error message:

test.d(2): Error: cannot access frame pointer of test.__lambda3.InnerStruct
test.d(10): Error: template instance test.func2!(InnerStruct) error
instantiating

Not an ICE.

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