On Tuesday, July 31, 2012 3:52:06 AM UTC-5, James  Cole wrote:
> Hi,
> 
> I don't usually enable spell-checking when I'm writing, as I find the 
> underlines under misspellings a bit distracting.  But sometimes I think or 
> know that a word is misspelt, and I'd like to be able to use z= to bring up a 
> list of spelling suggestions.
> 
> But doing this when spell-checking is not on brings up an error "E756: Spell 
> checking is not enabled".  My suggestion is to allow the user to see spelling 
> suggestions in such situations. I know it'd be possible to write a map to do 
> this, but it seems like it'd be a sensible default behavior for z=
> 
> For someone like me this would save the effort of having to first enable 
> spell-checking, and then turning it off again immediately afterwards (to 
> avoid the red underlines), and as far as I can see there would be no harm to 
> allow this.
> 
> Regards,
> James.

How about:

nnoremap z= :<C-U>set spell<CR>z=

And probably another mapping to turn off spell check if you want it.

Alternatively, you could just change the highlight to be less distracting, 
using :hi rules on SpellBad, SpellCap, SpellRare, and SpellLocal.

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