add compile error for non-inline for loop on comptime type

andrewrk · andrewrk · commit 84195467ad97 · 2018-07-25T17:08:55.000-04:00
diff --git a/src/ir.cpp b/src/ir.cpp
@@ -12142,7 +12142,7 @@ static TypeTableEntry *ir_analyze_instruction_decl_var(IrAnalyze *ira, IrInstruc
             result_type = ira->codegen->builtin_types.entry_invalid;
         } else if (type_requires_comptime(result_type)) {
             var_class_requires_const = true;
-            if (!var->src_is_const && !is_comptime_var) {
+            if (!var->gen_is_const && !is_comptime_var) {
                 ir_add_error_node(ira, source_node,
                     buf_sprintf("variable of type '%s' must be const or comptime",
                         buf_ptr(&result_type->name)));
diff --git a/test/compile_errors.zig b/test/compile_errors.zig
@@ -1,6 +1,20 @@
 const tests = @import("tests.zig");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
+    cases.add(
+        "non-inline for loop on a type that requires comptime",
+        \\const Foo = struct {
+        \\    name: []const u8,
+        \\    T: type,
+        \\};
+        \\export fn entry() void {
+        \\    const xx: [2]Foo = undefined;
+        \\    for (xx) |f| {}
+        \\}
+    ,
+        ".tmp_source.zig:7:15: error: variable of type 'Foo' must be const or comptime",
+    );
+
     cases.add(
         "generic fn as parameter without comptime keyword",
         \\fn f(_: fn (var) void) void {}
