[Issue 19387] New: [dip1000] __fieldPostblit should be scope or deduce scope qualifier

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19387

          Issue ID: 19387
           Summary: [dip1000] __fieldPostblit should be scope or deduce
                    scope qualifier
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ilyayaroshenko at gmail.com

Currently, the __fieldPostblit constructor is not scope, this cause bugs that
looks like:
scope variable __copytmpXXX assigned to non-scope parameter this calling
AType.__fieldPostblit.

For example:
------------
struct C
{
    void* u;
    this(this) scope @safe {}
}

struct S { C c; }
void foo(scope S s) @safe {}
void bar(scope S s) @safe { foo(s); }
------------
<source>(9): Error: scope variable `__copytmp2` assigned to non-scope parameter
`this` calling example.S.__fieldPostblit

Compiler returned: 1

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