Follow-up hints for DYM?

[som-snytt]

Compiler version

3.4.0-RC1-bin-SNAPSHOT-git-8046a8b

Minimized code

Welcome to Scala 3.4.0-RC1-bin-SNAPSHOT-git-8046a8b (21, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.

scala> "xyz".lengt  // duplicate suggestion
-- [E008] Not Found Error: ---------------------------------------------------------------------------------------------
1 |"xyz".lengt
  |^^^^^^^^^^^
  |value lengt is not a member of String - did you mean ("xyz" : String).length? or perhaps ("xyz" : String).length?
1 error found

scala> "xyz".lgnet  // should notice word scramble
-- [E008] Not Found Error: ---------------------------------------------------------------------------------------------
1 |"xyz".lgnet
  |^^^^^^^^^^^
  |value lgnet is not a member of String - did you mean ("xyz" : String).lines?
1 error found

from test

-- [E008] Not Found Error: test/files/neg/suggest-similar.scala:16:25 --------------------------------------------------
16 |  import scala.io.StdIn.{readline, readInt}
   |                         ^^^^^^^^
   |value readline is not a member of object scala.io.StdIn - did you mean StdIn.readLine? or perhaps StdIn.readLine?

// compare

suggest-similar.scala:16: error: value readline is not a member of object scala.io.StdIn
did you mean readLine? or perhaps readByte, readInt, or readLong?
  import scala.io.StdIn.{readline, readInt}
         ^

// but dotty is probably trimming the suggestions by length; maybe scala 2 admits too much;
// and scala 2 should not suggest `readInt`, which is already in the clause

another example where "word scramble" trumps edit length limits, dotty does not suggest abc for acb:

suggest-similar.scala:54: error: value acb is not a member of example.assignments.C
did you mean abc?
  def f = c.acb(42)
            ^

Dotty suggests x for y because y_= is 3 chars:

59 |  def v = c y_= 1
   |          ^^^^^
   |          value y_= is not a member of example.assignments.C - did you mean c.x_=? or perhaps c.z_=?

Output

As shown.

Expectation

No duplicate suggestion.

Taking "word scrambles" (all letters present but badly garbled by twitchy fingers) seems like a win.

Ignoring suffixes of setters seems like a win for the mutable crowd.

[som-snytt]

Not sure if the proper label is "linting" or "hinting". Probably a good Spree candidate!

[som-snytt]

31 |val _ = bar.ool // error
   |        ^^^^^^^
   |        value ool is not a member of object Bar - did you mean bar.cool? or perhaps bar.pool or bar.wool?

All suggestions are equally valid.

Scala 2 is agnostic:

+i18682.scala:36: error: value ool is not a member of object Bar
+did you mean cool, pool, or wool?
+  val _ = bar.ool // error
+              ^

[odersky]

I agree it is important. But I think I'll leave this to others to improve further.

My strategy is: when in doubt, it's better to hint less than more. So missing an "obvious" candidate is less problematic than suggesting improbably ones.

That's why I am less concerned about missed word scramble, but duplicates are certainly a problem. Also, we should not
print ("xyz" : String).length. "xyz".length is what we need here.

[som-snytt]

If Spree doesn't take it, I will. Also, I was comparing while preparing to backport the Dotty improvements. Thanks again for being a trailblazer! (Only mildly poking fun, the improvement is modest by some measure, but makes a real difference.)

I also enjoy the new rubric, "linting and hinting".

[odersky]

I think Scala Spree has probably lots of other puzzlers to solve, so it's all yours,