From ba2b7087afad47ff6a8e5f8f39501ebd72485a67 Mon Sep 17 00:00:00 2001
From: Eduard Urbach <eduard@urbach.dev>
Date: Tue, 29 Jul 2025 11:28:53 +0200
Subject: [PATCH] Added a check for unknown struct fields

---
 src/core/errors_test.go                | 1 +
 src/core/evaluateDot.go                | 2 +-
 src/core/testdata/UnknownStructField.q | 3 +++
 3 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 src/core/testdata/UnknownStructField.q

diff --git a/src/core/errors_test.go b/src/core/errors_test.go
index b3b0822..9836ed5 100644
--- a/src/core/errors_test.go
+++ b/src/core/errors_test.go
@@ -32,6 +32,7 @@ var errs = []struct {
 	{"UnknownIdentifier7.q", &core.UnknownIdentifier{Name: "os.unknown"}},
 	{"UnknownIdentifier8.q", &core.UnknownIdentifier{Name: "x"}},
 	{"UnknownIdentifier9.q", &core.UnknownIdentifier{Name: "x"}},
+	{"UnknownStructField.q", &core.UnknownStructField{StructName: "string", FieldName: "unknown"}},
 	{"UnusedValue.q", &core.UnusedValue{Value: "42"}},
 	{"UnusedValue2.q", &core.UnusedValue{Value: "2 + 3"}},
 	{"UnusedValue3.q", &core.UnusedValue{Value: "\"not used\""}},
diff --git a/src/core/evaluateDot.go b/src/core/evaluateDot.go
index 350542c..f28abc6 100644
--- a/src/core/evaluateDot.go
+++ b/src/core/evaluateDot.go
@@ -60,7 +60,7 @@ func (f *Function) evaluateDot(expr *expression.Expression) (ssa.Value, error) {
 		field := leftValue.Typ.FieldByName(rightText)
 
 		if field == nil {
-			panic("unknown field")
+			return nil, errors.New(&UnknownStructField{StructName: leftValue.Typ.Name(), FieldName: rightText}, f.File, right.Token.Position)
 		}
 
 		return f.Append(leftValue.Arguments[field.Index]), nil
diff --git a/src/core/testdata/UnknownStructField.q b/src/core/testdata/UnknownStructField.q
new file mode 100644
index 0000000..b47e80a
--- /dev/null
+++ b/src/core/testdata/UnknownStructField.q
@@ -0,0 +1,3 @@
+main() {
+	x := "Hello".unknown
+}
\ No newline at end of file
-- 
2.51.2