Iface linter should run on body of rules

Hannes Siebenhandlrequested to merge
fendor/ghc:wip/18085-iface-rule into master

Closes #18085 (closed)

Runs the linter on the body of rules.

The commit 88b68350 is necessary for fixing a bug in the linter (I think).

cc @mpickering

Edited by Hannes Siebenhandl

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