Import causes unhandled exception #2828

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1. swamishiju

   changed the title [-]Import causes unhandles exception[/-] [+]Import causes unhandled exception[/+] on Mar 15, 2025
2. swamishiju commented on Mar 15, 2025

   

   swamishiju

   on Mar 15, 2025

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   Well i found another issue with imports I believe both are linked

   from lpython import i32
   
   
   class Foo:
       def __init__(self: "Foo", a: i32):
           self.a: i32 = a
   
       def bar(self: "Foo") -> i32:
           return self.a
   
   
   def bux() -> i32:
       f: Foo = Foo(10)
       return f.bar()
   
   
   print(bux())

   The above code works and gives output

   $ lpython main.py
   10

   When we move the class definition into a separate python file

   foo.py

   from lpython import i32
   
   
   class Foo:
       def __init__(self: "Foo", a: i32):
           self.a: i32 = a
   
       def bar(self: "Foo") -> i32:
           return self.a
   
   
   def bux() -> i32:
       f: Foo = Foo(10)
       return f.bar()

   main.py

   import foo
   
   print(foo.bux())

   Now this code gives Internal Compiler Error: Unhandled exception but both give the same output with CPython
3. swamishiju commented on Mar 15, 2025

   

   swamishiju

   on Mar 15, 2025

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   I think I've found the issue. Import dependency checking doesn't ignore the local use of module variables. Below is a minimal reproduction of the error.

   foo.py

   a:i32 = 10
   b:i32 = a + 10

   main.py

   import foo
   

   Here the asr verifier sees that b needs as a dependencya which in turn leads foo to have itself as a dependency. This is what I think is happening, there are still a couple details to work out like how does it work when the import is used but I'll start working on a fix and open a PR.
4. swamishiju commented on Mar 23, 2025

   

   swamishiju

   on Mar 23, 2025

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   Related issue to the first one

   foo.py

   print("Hello,World")

   bar.py

   import foo

   main.py

   import foo
   import bar

   $ python main.py
   Hello,World
   
   $ lpython -I. main.py
   Hello,World
   Hello,World