# compress/flate
<unknown line number>: internal compiler error: panic: runtime error: invalid memory address or nil pointer dereference

goroutine 1 [running]:
runtime/debug.Stack()
	runtime/debug/stack.go:26 +0x8d
cmd/compile/internal/base.FatalfAt({0x0, 0x0}, {0x1548364, 0x9}, {0x4a92095c598, 0x1, 0x1})
	cmd/compile/internal/base/print.go:232 +0x277
cmd/compile/internal/base.Fatalf({0x1548364, 0x9}, {0x4a92095c598, 0x1, 0x1})
	cmd/compile/internal/base/print.go:197 +0x4d
cmd/compile/internal/gc.handlePanic()
	cmd/compile/internal/gc/main.go:58 +0xc6
panic({0x1d38cb8?, 0x1e3c620?})
	runtime/panic.go:859 +0x136
cmd/compile/internal/types2.(*Checker).handleBailout(0x4a920894400, 0x4a920960d10)
	cmd/compile/internal/types2/check.go:396 +0x23c
panic({0x1d38cb8?, 0x1e3c620?})
	runtime/panic.go:859 +0x136
internal/runtime/maps.memHashAES()
	internal/runtime/maps/memhash_amd64.s:288 +0x440
cmd/compile/internal/types2.(*Scope).Lookup(0x4a9208eb110, {0xb, 0x1da2a88})
	cmd/compile/internal/types2/scope.go:70 +0x59
cmd/compile/internal/types2.(*environment).lookupScope(0x4a920894570, {0xb, 0x1da2a88})
	cmd/compile/internal/types2/check.go:59 +0x65
cmd/compile/internal/types2.(*Checker).ident(0x4a920894400, 0x4a920f357c0, 0x4a920b98000, 0x0)
	cmd/compile/internal/types2/typexpr.go:24 +0xe5
cmd/compile/internal/types2.(*Checker).exprInternal(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2a88, 0x4a920b98000}, {0x0, 0x0})
	cmd/compile/internal/types2/expr.go:1050 +0x10a6
cmd/compile/internal/types2.(*Checker).rawExpr(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2a88, 0x4a920b98000}, {0x0, 0x0}, 0x1)
	cmd/compile/internal/types2/expr.go:993 +0x2db
cmd/compile/internal/types2.(*Checker).exprOrType(0x4a920894400, 0x4a920f357c0, {0x1da2a88, 0x4a920b98000}, 0x1)
	cmd/compile/internal/types2/expr.go:1390 +0x45
cmd/compile/internal/types2.(*Checker).callExpr(0x4a920894400, 0x4a920f357c0, 0x4a920902070)
	cmd/compile/internal/types2/call.go:184 +0x1ac
cmd/compile/internal/types2.(*Checker).exprInternal(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2ba8, 0x4a920902070}, {0x0, 0x0})
	cmd/compile/internal/types2/expr.go:1141 +0x712
cmd/compile/internal/types2.(*Checker).rawExpr(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2ba8, 0x4a920902070}, {0x0, 0x0}, 0x0)
	cmd/compile/internal/types2/expr.go:993 +0x2db
cmd/compile/internal/types2.(*Checker).expr(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2ba8, 0x4a920902070})
	cmd/compile/internal/types2/expr.go:1316 +0x35
cmd/compile/internal/types2.(*Checker).binary(0x4a920894400, 0x4a920f357c0, {0x1da2bf0, 0x4a92085c120}, {0x1da2ba8, 0x4a920902070}, {0x1da3100, 0x4a9208661e0}, 0x7)
	cmd/compile/internal/types2/expr.go:794 +0xeb
cmd/compile/internal/types2.(*Checker).exprInternal(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2bf0, 0x4a92085c120}, {0x0, 0x0})
	cmd/compile/internal/types2/expr.go:1219 +0x965
cmd/compile/internal/types2.(*Checker).rawExpr(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2bf0, 0x4a92085c120}, {0x0, 0x0}, 0x0)
	cmd/compile/internal/types2/expr.go:993 +0x2db
cmd/compile/internal/types2.(*Checker).expr(0x4a920894400, 0x0, 0x4a920f357c0, {0x1da2bf0, 0x4a92085c120})
	cmd/compile/internal/types2/expr.go:1316 +0x35
cmd/compile/internal/types2.(*Checker).stmt(0x4a920894400, 0x3, {0x1da23f0, 0x4a920882a00})
	cmd/compile/internal/types2/stmt.go:594 +0x248b
cmd/compile/internal/types2.(*Checker).stmtList(0x4a920894400, 0x3, {0x4a920b1c780, 0x5, 0x8})
	cmd/compile/internal/types2/stmt.go:124 +0x148
cmd/compile/internal/types2.(*Checker).stmt(0x4a920894400, 0x3, {0x1da2428, 0x4a920726a80})
	cmd/compile/internal/types2/stmt.go:586 +0x9ca
cmd/compile/internal/types2.(*Checker).stmt(0x4a920894400, 0x0, {0x1da2620, 0x4a920882870})
	cmd/compile/internal/types2/stmt.go:708 +0x8ad
cmd/compile/internal/types2.(*Checker).stmtList(0x4a920894400, 0x0, {0x4a920b22500, 0xa, 0x10})
	cmd/compile/internal/types2/stmt.go:124 +0x148
cmd/compile/internal/types2.(*Checker).funcBody(0x4a920894400, 0x4a920e05490, {0x4a92039d2fa, 0x6}, 0x4a920e6d040, 0x4a920726a00, {0x0, 0x0})
	cmd/compile/internal/types2/stmt.go:41 +0x4d5
cmd/compile/internal/types2.(*Checker).funcDecl.func1()
	cmd/compile/internal/types2/decl.go:706 +0x91
cmd/compile/internal/types2.(*Checker).processDelayed(0x4a920894400, 0x0)
	cmd/compile/internal/types2/check.go:504 +0x2ce
cmd/compile/internal/types2.(*Checker).checkFiles(0x4a920894400, {0x4a9208d6e80, 0xf, 0xf})
	cmd/compile/internal/types2/check.go:446 +0x11f
cmd/compile/internal/types2.(*Checker).Files(0x4a920894400, {0x4a9208d6e80, 0xf, 0xf})
	cmd/compile/internal/types2/check.go:414 +0x10c
cmd/compile/internal/types2.(*Config).Check(0x4a9208e59e0, {0x7ffc0ba39d83, 0xe}, {0x4a9208d6e80, 0xf, 0xf}, 0x4a9208e5a40)
	cmd/compile/internal/types2/api.go:478 +0xa7
cmd/compile/internal/noder.checkFiles({0x0, {0x0, 0x0}}, {0x4a9203ca880, 0xf, 0xf})
	cmd/compile/internal/noder/irgen.go:100 +0x92f
cmd/compile/internal/noder.writePkgStub({0x0, {0x0, 0x0}}, {0x4a9203ca880, 0xf, 0xf})
	cmd/compile/internal/noder/unified.go:328 +0xac
cmd/compile/internal/noder.unified({0x0, {0x0, 0x0}}, {0x4a9203ca880, 0xf, 0xf})
	cmd/compile/internal/noder/unified.go:204 +0xfc
cmd/compile/internal/noder.LoadPackage({0x4a9203ac3e8, 0xf, 0x11})
	cmd/compile/internal/noder/noder.go:76 +0x4b4
cmd/compile/internal/gc.Main(0x1da7240)
	cmd/compile/internal/gc/main.go:218 +0xeec
main.main()
	cmd/compile/main.go:57 +0x165