(towards #3083) Extend treesitter frontend

pyproject.toml

@@ -91,11 +91,11 @@ test = [
     "pytest-cov",
     "pytest-xdist",
     "tree-sitter",
-    "tree-sitter-fortran"
+    "tree-sitter-fortran==0.6.0"
 ]
 treesitter = [
     "tree-sitter",
-    "tree-sitter-fortran"
+    "tree-sitter-fortran==0.6.0"
 ]
 
 [project.urls]

src/psyclone/psyir/backend/fortran.py

@@ -1649,8 +1649,8 @@ def codeblock_node(self, node):
             for line in node.get_fortran_lines():
                 result += f"{self._nindent}{line}\n"
         elif node.structure == CodeBlock.Structure.EXPRESSION:
-            for ast_node in node.parse_tree_nodes:
-                result += str(ast_node)
+            # No indent or newlines
+            result = "".join(node.get_fortran_lines())
         else:
             raise VisitorError(
                 f"Unsupported CodeBlock Structure '{node.structure}' found.")