No tabs in :t output

I'd like that :t doesn't generate output containing tab characters.

Trac metadata

Trac field	Value
Version	6.7
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	GHCi
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown

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