Remove constant expressions (such as multiline comments)

opshin/compiler.py

@@ -2,6 +2,7 @@
 from logging import getLogger
 from ast import fix_missing_locations
 
+from .optimize.optimize_remove_comments import OptimizeRemoveDeadconstants
 from .rewrite.rewrite_augassign import RewriteAugAssign
 from .rewrite.rewrite_forbidden_overwrites import RewriteForbiddenOverwrites
 from .rewrite.rewrite_import import RewriteImport
@@ -945,6 +946,7 @@ def compile(
         # Apply optimizations
         OptimizeRemoveDeadvars(),
         OptimizeVarlen(),
+        OptimizeRemoveDeadconstants(),
         OptimizeRemovePass(),
         # the compiler runs last
         UPLCCompiler(

opshin/optimize/optimize_remove_comments.py

@@ -0,0 +1,16 @@
+from ast import *
+
+from ..util import CompilingNodeTransformer
+
+"""
+Removes expressions that return constants in sequences of statements (i.e. string comments)
+"""
+
+
+class OptimizeRemoveDeadconstants(CompilingNodeTransformer):
+    step = "Removing constants (i.e. string comments)"
+
+    def visit_Expr(self, node: Expr):
+        if isinstance(node.value, Constant):
+            return None
+        return node