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