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Match anonymous record's type inference with nominal records inference #759

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gusty opened this issue Jun 23, 2019 · 0 comments

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commented Jun 23, 2019

Title of Suggestion

I propose we use the same type of inference as for nominal records

The way it works now is that anonymous records inference occurs at a later stage.

Pros and Cons

The advantages of making this adjustment to F#: Currently because anonymous records are inferred at a later stage they are more prone to be type annotated than nominal records, which defeats the whole purpose of having anonymous records.

The disadvantages of making this adjustment to F#: Nominal records inference is considered a bit weird because when two records contain the same field names, the compiler takes the last one that was declared.

Extra information

Estimated cost: M

Related suggestions: dotnet/fsharp#6699

Affidavit (please submit!)

Please tick this by placing a cross in the box:

  • This is not a question (e.g. like one you might ask on stackoverflow) and I have searched stackoverflow for discussions of this issue
  • I have searched both open and closed suggestions on this site and believe this is not a duplicate
  • This is not something which has obviously "already been decided" in previous versions of F#. If you're questioning a fundamental design decision that has obviously already been taken (e.g. "Make F# untyped") then please don't submit it.

Please tick all that apply:

  • This is not a breaking change to the F# language design
  • I or my company would be willing to help implement and/or test this
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