Circular modules but not circular dependencies

caddy-v2 go.mod

module github.com/caddyserver/caddy/v2

go 1.13

require (
	github.com/Masterminds/sprig/v3 v3.0.0
	github.com/alecthomas/chroma v0.7.0
	github.com/andybalholm/brotli v0.0.0-20190821151343-b60f0d972eeb
	github.com/caddyserver/tls.dns v0.0.0-00010101000000-000000000000
	github.com/dustin/go-humanize v1.0.0
	github.com/go-acme/lego/v3 v3.3.0
	github.com/golang/groupcache v0.0.0-20191002201903-404acd9df4cc
	github.com/ilibs/json5 v1.0.1
	github.com/jsternberg/zap-logfmt v1.2.0
	github.com/klauspost/compress v1.8.6
	github.com/klauspost/cpuid v1.2.2
	github.com/lucas-clemente/quic-go v0.14.1
	github.com/mholt/certmagic v0.9.3
	github.com/muhammadmuzzammil1998/jsonc v0.0.0-20190906142622-1265e9b150c6
	github.com/naoina/toml v0.1.1
	github.com/vulcand/oxy v1.0.0
	github.com/yuin/goldmark v1.1.17
	github.com/yuin/goldmark-highlighting v0.0.0-20191202084645-78f32c8dd6d5
	go.uber.org/zap v1.10.0
	golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413
	golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553
	gopkg.in/natefinch/lumberjack.v2 v2.0.0
	gopkg.in/yaml.v2 v2.2.2
)

replace github.com/caddyserver/tls.dns => /Users/matt/Dev/caddyserver/tls.dns

tls.dns go.mod

module github.com/caddyserver/tls.dns

go 1.13

require (
	github.com/caddyserver/caddy/v2 v2.0.0-beta.13
	github.com/go-acme/lego/v3 v3.3.0
)

replace github.com/caddyserver/caddy/v2 => /Users/matt/Dev/caddyserver/caddy