Anything wrong with this code?

Last night I built a copy of gfortran from a snapshot of the latest 16.0 trunk (to test a different bug that they fixed). Compiles your code fine as well.

The lfortran compiler (a snapshot from a few days ago) does not:

$ lfortran -c bst_base.f90
semantic error: Derived type 'bst_base_node_type' not declared
  --> bst_base.f90:16:7
   |
16 |       class(bst_base_node_type), allocatable :: left
   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 


Note: Please report unclear, confusing or incorrect messages as bugs at
https://github.com/lfortran/lfortran/issues.
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