feat: wire error handling into repl flow

CHANGELOG.md

@@ -35,5 +35,6 @@ Now in Zig!
 - [x] Parse minimal variable binding
 - [x] Parse minimal statement
 - [x] Parse minimal module
+- [x] Generate error messages
 
 

src/errors/root.zig

@@ -145,7 +145,6 @@ test "should get line from 2 lines (3)" {
 }
 
 test "should gen error message" {
-    // get_error_str
     const source = "print(ehh)";
     var err = ErrorData{
         .reason = "Invalid identifier",

src/main.zig

@@ -76,9 +76,12 @@ fn repl() !void {
         }
 
         // Print errors
-        for (error_array.items) |err| {
+        for (error_array.items) |e| {
-            try stdout.print("Lex error: {s} at pos {d}\n", .{ err.reason, err.start_position });
+            var err = e;
+            const err_str = try err.get_error_str(line, "repl", std.heap.page_allocator);
+            try stdout.print("\n{s}\n", .{err_str});
             try bw.flush();
+            std.heap.page_allocator.free(err_str);
         }
 
         // next repl line