Debug.eval not seeing local variables if run in project mode

[wdanilo]

This task is automatically imported from the old Task Issue Board and it was originally created by Radosław Waśko.
Original issue is here.

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Create a new Enso project consisting of two files F1.enso and Main.enso with the following contents:

F1.enso:

from Standard.Base import all
import Standard.Base.Runtime.Debug

foo =
    c = 1
    f x y =
      if x == 0 then y else
         Debug.eval "f (x-1) (x+y+c)"
    IO.println (f 10 0)

main =
    foo

Main.enso:

from Standard.Base import all
import project.F1

main = 
    F1.foo

Then run the project in the following ways:

enso run src/F1.enso
enso run src/Main.enso

The first invocation should work and print 65 (along with a warning that c is unused, that is expected).
The second invocation may sometimes work, but often (unfortunately this seems non-deterministic so many tries may be needed, usually should be observable in every 1-3 runs) it will fail with the following error:

In module local.Project_123.F1:
Compiler encountered warnings:
F1.enso[5:5-5:5]: Unused variable c.
Compiler encountered errors:
<interactive_source>[1:1-1:1]: The name `f` could not be found.
<interactive_source>[1:4-1:4]: The name `x` could not be found.
<interactive_source>[1:10-1:10]: The name `x` could not be found.
<interactive_source>[1:12-1:12]: The name `y` could not be found.
<interactive_source>[1:14-1:14]: The name `c` could not be found.
Execution finished with an error: Compilation aborted due to errors.
        at <enso> Debug.eval(Internal)
        at <enso> f<arg-2>(/home/radeusgd/NBO/repr/Project123/src/F1.enso:8:10-37)
        at <enso> Boolean.if_then_else(Internal)
        at <enso> f(/home/radeusgd/NBO/repr/Project123/src/F1.enso:7-8)
        at <enso> F1.foo<arg-1>(/home/radeusgd/NBO/repr/Project123/src/F1.enso:9:17-22)
        at <enso> F1.foo(/home/radeusgd/NBO/repr/Project123/src/F1.enso:9:5-23)
        at <enso> Main.main(Main.enso:5:5-10)

I'm using the Enso launcher to run the project, but running directly using the engine runner should probably give the same results.

Comments:

Note: the same applies if we change F1.enso to:

from Standard.Base import all
import Standard.Base.Runtime.Debug

foo =
    c = 1
    f = x -> y ->
      if x == 0 then y else
         Debug.eval "f (x-1) (x+y+c)"
    IO.println (f 10 0)

main =
    foo

The two syntaxes are probably equivalent (as they should be). (Radosław Waśko - Nov 29, 2022)

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Not for release - worth investigating at some point. (James Dunkerley - Feb 3, 2023)

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