AstGen: improve error message for missing parameter name

Closes #13393

1 files changed, 19 insertions, 0 deletions

diff --git a/test/cases/compile_errors/missing_parameter_name.zig b/test/cases/compile_errors/missing_parameter_name.zig
new file mode 100644
index 0000000000..3e576a1a6d
--- /dev/null
+++ b/test/cases/compile_errors/missing_parameter_name.zig
@@ -0,0 +1,19 @@
+fn f2(u64) u64 {
+    return x;
+}
+fn f3(*x) u64 {
+    return x;
+}
+fn f1(x) u64 {
+    return x;
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :1:7: error: missing parameter name
+// :4:7: error: missing parameter name
+// :7:7: error: missing parameter name or type
+// :7:7: note: if this is a name, annotate its type 'x: T'
+// :7:7: note: if this is a type, give it a name '<name>: x'