Bug 7129 – Compiling certain nested structs with -inline causes error "*** is a nested function and cannot be accessed from ***"

This regression was introduced with the 2.057 release. I first hit the issue with code resembling the following: --------------------------------------------------------- import std.stdio, std.algorithm; void main() { writeln(filter!"a != 'r'"("Merry Christmas!")); } -------------------------------------------------------- Compiling with -inline gives: /src/phobos/std/algorithm.d(1120): Error: function std.algorithm.filter!("a != 'r'").filter!(string).filter is a nested function and cannot be accessed from formatValue This reduced test case gives a clue as to what is going on: --------------------------------------------------------- auto fun() { struct Result { this(int u) {} auto bar() { return Result(0); } } return Result(); } void main() { auto t = fun(); auto a = t.bar(); } --------------------------------------------------------- Compiled with -inline: t.d(7): Error: function t.fun is a nested function and cannot be accessed from main It seems what is happening is that bar is being inlined in main, but dmd doesn't know where to get the new fun.Result's context pointer from.

Isn't this in Bugzilla already?

I can't find any mention of this error in conjunction with the inline switch.

This isn't a regression. The reduced test case behaved the same in 2.026, which was the first version that could compile 'auto' functions. This is probably a duplicate of bug 4724 (which involves -inline). Could also be a dup of bug 4286 or bug 4841 (which involves -inline, but uses delegates and alias templates) Bug 5941 seems to be simplest test case for this species of bug.

Can't reproduce with the original test case, but this version still fails: auto fun() { int i; struct Result { this(int u) {} auto bar() { i = 42; } } return Result(); } void main() { auto t = fun(); t.bar(); }

Mark it as a duplicate and add failing test from Comment 4 to Issue 4841. *** This issue has been marked as a duplicate of issue 4841 ***