Open Radar

 
Summary:
Trying to use the string(from:) method on MeasurementFormatter in a Swift Playground fails as there are two methods that match the signature, and the compiler can’t figure out which one to use.

Steps to Reproduce:
1. Create a Measurement in a playground.
2. Create a MeasurementFormatter to format it.
3. Call string(from:) on the formatter, passing in the measurement.

Expected Results:
The method returns a string.

Actual Results:
The compiler fails to build the playground. Here are the relevant messages:

Playground execution failed: error: Measurements.playground:1:51: error: cannot invoke 'string' with an argument list of type '(from: Measurement<UnitTemperature>)'
let formattedTemperature = MeasurementFormatter().string(from: idealTemperature)
                                                  ^

Measurements.playground:1:51: note: overloads for 'string' exist with these partially matching parameter lists: (from: Measurement<Unit>), (from: Unit)
let formattedTemperature = MeasurementFormatter().string(from: idealTemperature)

Version:
Version 8.0 beta 3 (8S174q)

Notes:
See attached playground.