stage1: fix exporting enums

After extern enums were removed, stage1 was left in an incorrect state
of checking for `extern enum` for exported enums. This commit fixes it
to look for an explicit integer tag type instead, and adds test coverage
for the compile error case as well as the success case.

closes #9498

1 files changed, 8 insertions, 4 deletions

diff --git a/src/stage1/ir.cpp b/src/stage1/ir.cpp
index 9a3b938dbd..0684b7bce1 100644
--- a/src/stage1/ir.cpp
+++ b/src/stage1/ir.cpp
@@ -11380,9 +11380,11 @@ static Stage1AirInst *ir_analyze_instruction_export(IrAnalyze *ira, Stage1ZirIns
             }
             break;
         case ZigTypeIdEnum:
-            if (target->value->type->data.enumeration.layout != ContainerLayoutExtern) {
+            if ((err = type_resolve(ira->codegen, target->value->type, ResolveStatusZeroBitsKnown)))
+                return ira->codegen->invalid_inst_gen;
+            if (!target->value->type->data.enumeration.has_explicit_tag_type) {
                 ErrorMsg *msg = ir_add_error(ira, target,
-                    buf_sprintf("exported enum value must be declared extern"));
+                    buf_sprintf("exported enum value without explicit integer tag type"));
                 add_error_note(ira->codegen, msg, target->value->type->data.enumeration.decl_node, buf_sprintf("declared here"));
             } else {
                 want_var_export = true;
@@ -11425,9 +11427,11 @@ static Stage1AirInst *ir_analyze_instruction_export(IrAnalyze *ira, Stage1ZirIns
                     }
                     break;
                 case ZigTypeIdEnum:
-                    if (type_value->data.enumeration.layout != ContainerLayoutExtern) {
+                    if ((err = type_resolve(ira->codegen, type_value, ResolveStatusZeroBitsKnown)))
+                        return ira->codegen->invalid_inst_gen;
+                    if (!type_value->data.enumeration.has_explicit_tag_type) {
                         ErrorMsg *msg = ir_add_error(ira, target,
-                            buf_sprintf("exported enum must be declared extern"));
+                            buf_sprintf("exported enum without explicit integer tag type"));
                         add_error_note(ira->codegen, msg, type_value->data.enumeration.decl_node, buf_sprintf("declared here"));
                     }
                     break;