fix(codegen): native compiler segfaulted on every emitError path because emitError chained getErrors() twice per expression — extract to intermediate vars and add module-scope Date fixtures (#521)

Co-authored-by: cs01 <cs01@users.noreply.github.com>

Author: cs01

src/codegen/llvm-generator.ts

@@ -332,9 +332,9 @@ export class LLVMGenerator extends BaseGenerator implements IGeneratorContext {
 
   public emitError(message: string, loc?: SourceLocation, suggestion?: string): never {
     this.diagnostics.error(message, loc, suggestion);
-    const output = this.diagnostics.formatDiagnostic(
-      this.diagnostics.getErrors()[this.diagnostics.getErrors().length - 1],
-    );
+    const errs = this.diagnostics.getErrors();
+    const last = errs[errs.length - 1];
+    const output = this.diagnostics.formatDiagnostic(last);
     process.stderr.write(output);
     process.exit(1);
   }

tests/fixtures/edge-cases/new-date-module-scope.ts

@@ -0,0 +1,3 @@
+// @test-compile-error: cannot determine type of module-scope variable
+// @test-description: new Date() at module scope emits clean compile error instead of segfault
+const d = new Date();

tests/fixtures/edge-cases/new-date-zero-module-scope.ts

@@ -0,0 +1,3 @@
+// @test-compile-error: cannot determine type of module-scope variable
+// @test-description: new Date(0) at module scope emits clean compile error instead of segfault
+const d = new Date(0);