Bug 20182 – [REG 2.086.0] std.traits.ParameterDefaults fails for copy constructor of nested struct

Test case: --- void main() { import std.traits: ParameterDefaults; struct S { this(ref S) {} } pragma(msg, ParameterDefaults!(S.__ctor)); } --- 2.068.2 to 2.085.1: Success with output: (void) Since 2.086.0: Failure with output: ----- /path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/traits.d-mixin-1489(1497): Error: cannot access frame pointer of `onlineapp.main.S` /path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/traits.d-mixin-1489(1500): Error: cannot access frame pointer of `onlineapp.main.S` /path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/traits.d(1524): Error: template instance `std.traits.ParameterDefaults!(__ctor).Get!0LU` error instantiating /path/to/dmd.linux/dmd2/linux/bin64/../../src/phobos/std/traits.d(1527): instantiated from here: `Impl!0LU` onlineapp.d(10): instantiated from here: `ParameterDefaults!(__ctor)` onlineapp.d(10): while evaluating `pragma(msg, ParameterDefaults!(__ctor))` -----

@RazvanN7 created dlang/phobos pull request #8433 "Fix Issue 20182 - [REG 2.086.0] std.traits.ParameterDefaults fails for copy constructor of nested struct" fixing this issue: - Fix Issue 20182 - [REG 2.086.0] std.traits.ParameterDefaults fails for copy constructor of nested struct https://github.com/dlang/phobos/pull/8433

dlang/phobos pull request #8433 "Fix Issue 20182 - [REG 2.086.0] std.traits.ParameterDefaults fails for copy constructor of nested struct" was merged into master: - 354666be95cd33161501a404e4781b6584d46c8d by RazvanN7: Fix Issue 20182 - [REG 2.086.0] std.traits.ParameterDefaults fails for copy constructor of nested struct https://github.com/dlang/phobos/pull/8433