nodes: add PseudoNode to store fake nodes used to improve diagnostics

compiler/nodes.py

@@ -6,7 +6,7 @@ from typing import Any, Iterable
 
 from beartype import beartype
 
-from . import ir, semantic
+from . import ir, semantic, tokenizer
 from .errors import SemanticAnalysisError, OverrideMandatoryError
 from .logger import Logger
 from .source import SourceLocation
@@ -111,6 +111,22 @@ class Literal(Node, ABC):
         return result
 
 
+class PseudoNode(Literal):
+    """
+    Only used for better diagnostics
+    """
+
+    def __init__(self, token: tokenizer.Token):
+        super().__init__(token.loc, token.value)
+        self.token = token
+
+    def intermediate_representation(self) -> list[ir.IRItem]:
+        return []
+
+    def semantic_analysis(self, context: semantic.Context):
+        pass
+
+
 class Sum(Node):
     def intermediate_representation(self) -> list[ir.IRItem]:
         result: list[ir.IRAction] = []