Bug 20063 – compiler segfaults on passing templates expression to lazy val

import std; struct S { void f(alias fun)() {} } auto handleLazily(T)(lazy T expr) {} void main() { class C {} S().f!(() => new C()) .handleLazily; } Produced "Segmentation fault (core dumped)" dmd ver 2.087 LDC produces compiler error: onlineapp.d(12): Error: template instance `f!(delegate () => new C)` cannot use local __lambda2 as parameter to non-global template f(alias fun)()

That's a 2.087 regression caused by the fix for non global templates (https://issues.dlang.org/show_bug.cgi?id=5710).

@SSoulaimane created dlang/dmd pull request #10196 "Fix issue 20063 - Patch closure variables when converting expressions to delegates" fixing this issue: - Fix issue 20063 - Patch closure variables when converting expressions to delegates https://github.com/dlang/dmd/pull/10196

dlang/dmd pull request #10196 "Fix issue 20063 - Patch closure variables when converting expressions to delegates" was merged into stable: - 127fc3fc07c8c62402f8dd8d2ee3b08dc72b5395 by سليمان السهمي (Suleyman Sahmi): Fix issue 20063 - Patch closure variables when converting expressions to delegates https://github.com/dlang/dmd/pull/10196