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REPL doesn't report op= mutations #12894

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som-snytt opened this issue Oct 17, 2023 · 1 comment · May be fixed by scala/scala#10728
Open

REPL doesn't report op= mutations #12894

som-snytt opened this issue Oct 17, 2023 · 1 comment · May be fixed by scala/scala#10728
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@som-snytt
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Reproduction steps

Scala version: 2.13

scala 2.13.12> var x = 42
var x: Int = 42

scala 2.13.12> x = 17
// mutated x

scala 2.13.12> x += 10

scala 2.13.12> x
val res1: Int = 27

Problem

It should say that x was mutated by assignment +=.
@SethTisue SethTisue added the repl label Oct 17, 2023
@SethTisue SethTisue added this to the Backlog milestone Jan 26, 2024
@SethTisue
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SethTisue commented Jan 26, 2024 •
edited

This would be a good little starter project for somebody, either in Scala 2 or Scala 3 or both.

In Scala 3 (3.4.0-RC3), instead of "mutated x" it actually shows the new value, which seems like a better design:

scala> var x = 42
var x: Int = 42
                                                                                                    
scala> x = 20
x: Int = 20

But Scala 3 also fails to handle += and friends the same way it handles plain assignment

scala> x += 10
                                                                                                    
scala>

@som-snytt som-snytt linked a pull request Mar 25, 2024 that will close this issue
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Handle assignment ops som-snytt/scala
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@SethTisue @som-snytt