add compile error for missing parameter name of generic function

src/ir.cpp

@@ -12591,6 +12591,7 @@ static bool ir_analyze_fn_call_generic_arg(IrAnalyze *ira, AstNode *fn_proto_nod
     }
 
     Buf *param_name = param_decl_node->data.param_decl.name;
+    if (!param_name) return false;
     if (!is_var_args) {
         VariableTableEntry *var = add_variable(ira->codegen, param_decl_node,
             *child_scope, param_name, true, arg_val, nullptr);

test/compile_errors.zig

@@ -1,6 +1,17 @@
 const tests = @import("tests.zig");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
+    cases.add(
+        "missing parameter name of generic function",
+        \\fn dump(var) void {}
+        \\export fn entry() void {
+        \\    var a: u8 = 9;
+        \\    dump(a);
+        \\}
+    ,
+        ".tmp_source.zig:1:9: error: missing parameter name",
+    );
+
     cases.add(
         "non-inline for loop on a type that requires comptime",
         \\const Foo = struct {