Doug Gregor 945c09b1cc [Type checker] Improve diagnostics when an optional value is not unwrapped. ...

When we determine that an optional value needs to be unwrapped to make
an expression type check, use notes to provide several different
Fix-It options (with descriptions) rather than always pushing users
toward '!'. Specifically, the errors + Fix-Its now looks like this:

    error: value of optional type 'X?' must be unwrapped to a value of
        type 'X'
      f(x)
        ^
    note: coalesce using '??' to provide a default when the optional
        value contains 'nil'
      f(x)
        ^
          ?? <#default value#>
    note: force-unwrap using '!' to abort execution if the optional
        value contains 'nil'
      f(x)
         ^
         !

Fixes rdar://problem/42081852.

2018-07-13 11:02:04 -07:00

2.9 KiB

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