unused-definitions

Linter: every reference definition is used by a reference link.

Example#

doc.md:

See the [guide].

[guide]: docs/guide.md
[old]: docs/old.md

With docs/guide.md in the repository, markright check reports:

doc.md:4: unused definition: [old] (unused-definitions)
markright: 1 issue(s)

Fixed:

See the [guide].

[guide]: docs/guide.md

Turning it off#

linters:
  disable: [unused-definitions]

[linters]
disable = ["unused-definitions"]

More in Rules.