♻️ simplifying semantic analyzer

Author: igorkulman

PascalInterpreter/PascalInterpreter/Semantic analyzer/SemanticAnalyzer.swift

@@ -62,14 +62,8 @@ public class SemanticAnalyzer {
                 symbolTable.insert(.variable(name: name, type: .real))
             }
         case let .assignment(left: left, right: right):
-            guard case let .variable(name) = left else {
-                fatalError("Assignment left side is not a variable")
-            }
-            guard symbolTable.lookup(name) != nil else {
-                fatalError("Symbol(indetifier) not found '\(name)'")
-            }
-
             visit(node: right)
+            visit(node: left)
         case .type:
             break
         case .procedure:

PascalInterpreter/PascalInterpreterTests/SemanticAnalyzer.swift

@@ -65,7 +65,7 @@ class SemanticAnalyzerTests: XCTestCase {
         let node = parser.parse()
 
         let analyzer = SemanticAnalyzer()
-        expectFatalError(expectedMessage: "Cannot assign to undeclared variable x") {
+        expectFatalError(expectedMessage: "Symbol(indetifier) not found 'x'") {
             _ = analyzer.build(node: node)
         }
     }