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T20113.hs:7:35: error: [GHC-55287]
• The newtype constructor pattern
does not have a fixed runtime representation.
Its type is:
a :: TYPE rep
• In the pattern: MkY {y_fld = $sel:y_fld:MkY}
In an equation for ‘T20113.$sel:y_fld:MkY’:
T20113.$sel:y_fld:MkY MkY {y_fld = $sel:y_fld:MkY} = $sel:y_fld:MkY
T20113.hs:7:35: error: [GHC-55287]
The first pattern in the equation for ‘$sel:y_fld:MkY’
does not have a fixed runtime representation.
Its type is:
Y a :: TYPE rep
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