-hsSigDoc (Sig _ _ loc) = (SLIT("type signature"),loc)
-hsSigDoc (ClassOpSig _ _ _ loc) = (SLIT("class-method type signature"), loc)
-hsSigDoc (SpecSig _ _ loc) = (SLIT("SPECIALISE pragma"),loc)
-hsSigDoc (InlineSig True _ _ loc) = (SLIT("INLINE pragma"),loc)
-hsSigDoc (InlineSig False _ _ loc) = (SLIT("NOINLINE pragma"),loc)
-hsSigDoc (SpecInstSig _ loc) = (SLIT("SPECIALISE instance pragma"),loc)
-hsSigDoc (FixSig (FixitySig _ _ loc)) = (SLIT("fixity declaration"), loc)
+hsSigDoc (Sig _ _ loc) = (ptext SLIT("type signature"),loc)
+hsSigDoc (ClassOpSig _ _ _ loc) = (ptext SLIT("class-method type signature"), loc)
+hsSigDoc (SpecSig _ _ loc) = (ptext SLIT("SPECIALISE pragma"),loc)
+hsSigDoc (InlineSig True _ _ loc) = (ptext SLIT("INLINE pragma"),loc)
+hsSigDoc (InlineSig False _ _ loc) = (ptext SLIT("NOINLINE pragma"),loc)
+hsSigDoc (SpecInstSig _ loc) = (ptext SLIT("SPECIALISE instance pragma"),loc)
+hsSigDoc (FixSig (FixitySig _ _ loc)) = (ptext SLIT("fixity declaration"), loc)