Missing Template Symbols

[Andrew Wiley]

I've tried to start building my project with xfbuild today (running
everything through DMD was finally starting to get slow), and every so
often, Optlink dies with something like this:
OPTLINK (R) for Win32  Release 8.00.8
Copyright (C) Digital Mars 1989-2010  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
.objs\dinecraft-world-backend-backend.obj(dinecraft-world-backend-backend)
 Error 42: Symbol Undefined
_D3std11concurreéy83__T6_spawnTOC9dinecraft5world7backenÿd12W€„—B€†ŽTS€‘Ð3TidZ€‡ÐFbPF€°Ó€—Òv€ÇÈ€–—
.objs\dinecraft-world-backend-backend.obj(dinecraft-world-backend-backend)
 Error 42: Symbol Undefined
_D3std11concurreéy59__T5_sendTOC9dinecraft5world7back€ƒ›6bridge13ChunkResponseZ€†¸FS€‘Ö3Tid€±Îv
.objs\dinecraft-world-backend-backend.obj(dinecraft-world-backend-backend)
 Error 42: Symbol Undefined
_D3std11concurreéy60__T5_sendTOC9dinecraft5world7back€ƒ›6bridge14PlayerResponseZ€†¹FS€‘×3Tid€²Ïv
.objs\dinecraft-world-backend-backend.obj(dinecraft-world-backend-backend)
 Error 42: Symbol Undefined
_D3std11concurrency262__T8checkopsTDFOC9dinecraft6global11StopMessageZvTDFOC9dinecraft5world7bac16BA63AB4F5238EB56B8A073CCF850BC
.objs\dinecraft-world-backend-backend.obj(dinecraft-world-backend-backend)
 Error 42: Symbol Undefined
_D3std11concurrency10MessageBox257__T3getTDFOC9dinecraft6global11StopMessageZvTDFOC9dinecraft5wo153D92039F751A809C20E14F769954BC
.objs\dinecraft-world-gen-worldgen.obj(dinecraft-world-gen-worldgen)
 Error 42: Symbol Undefined
_D3std11concurreéy75__T6_spawnTOC9dinecraft5world3gen8€…Š€„‰W€„‰GenTS€‘È3TidZ€‡ÈFbPF€¨Ë€—Êv€¿À€–—
.objs\dinecraft-world-gen-worldgen.obj(dinecraft-world-gen-worldgen)
 Error 42: Symbol Undefined
_D3std4conv62__T6toImplTAyaTC9dinecraft5world7backend6bridge12ChunkRequestZ€‡»F€®·x€ƒêZÚ
.objs\dinecraft-world-gen-worldgen.obj(dinecraft-world-gen-worldgen)
 Error 42: Symbol Undefined
_D3std11concurreéy102__T8checkopsTDFOC9dinecraft5world7backend6bridge12ChunkRequestZv€�´6global11StopMessageZvZ€‰ãF€³ã€¥âv
.objs\dinecraft-world-gen-worldgen.obj(dinecraft-world-gen-worldgen)
 Error 42: Symbol Undefined
_D3std11concurreéy10MessageBox97__T3getTDFOC9dinecraft5world7backend6bridge12ChunkRequestZv€�´6global11Stop€‡ãZvZ€„ÞMF€³ß€¥Þb

To me, this looks like I'm somehow missing template implementations. When I
delete all the object files and build again, everything generally works. Is
there any reason this happens and/or a way to fix it?
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