Crashes on macOS 10.15.7

[ghoffart]

Downloaded newest release v0.1.1, set x-bit and executed it on macOS 10.15.7 (Intel). Result:

$ /Users/gh/Downloads/qrc_darwin_amd64 <2>
failed MSpanList_Insert 0x236000 0x9c1a2ab5cac 0x0
fatal error: MSpanList_Insert

runtime stack:
runtime.throw(0x1ed0fb)
/usr/lib/go/src/pkg/runtime/panic.c:520 +0x69
runtime.MSpanList_Insert(0x203428, 0x236000)
/usr/lib/go/src/pkg/runtime/mheap.c:618 +0x8a
MHeap_FreeLocked(0x1ff420, 0x236000)
/usr/lib/go/src/pkg/runtime/mheap.c:447 +0x1a6
MHeap_Grow(0x1ff420, 0x10)
/usr/lib/go/src/pkg/runtime/mheap.c:341 +0x1ae
MHeap_AllocLocked(0x1ff420, 0x1, 0x2)
/usr/lib/go/src/pkg/runtime/mheap.c:222 +0x379
runtime.MHeap_Alloc(0x1ff420, 0x1, 0x10000000002)
/usr/lib/go/src/pkg/runtime/mheap.c:178 +0x7b
MCentral_Grow(0x207838)
/usr/lib/go/src/pkg/runtime/mcentral.c:265 +0x89
runtime.MCentral_CacheSpan(0x207838)
/usr/lib/go/src/pkg/runtime/mcentral.c:84 +0x14b
runtime.MCache_Refill(0x232000, 0x2)
/usr/lib/go/src/pkg/runtime/mcache.c:78 +0x119
runtime.mallocgc(0x10, 0x0, 0x10)
/tmp/buildd/golang-1.3.1/src/pkg/runtime/malloc.goc:152 +0x30e
runtime.malloc(0x10)
/tmp/buildd/golang-1.3.1/src/pkg/runtime/malloc.goc:264 +0x39
runtime.mallocinit()
/tmp/buildd/golang-1.3.1/src/pkg/runtime/malloc.goc:575 +0x2a5
runtime.schedinit()
/usr/lib/go/src/pkg/runtime/proc.c:150 +0x36
_rt0_go()
/usr/lib/go/src/pkg/runtime/asm_amd64.s:91 +0x114