fix null debug info for 0-length array type

closes #702

2 files changed, 12 insertions, 1 deletions

diff --git a/src/analyze.cpp b/src/analyze.cpp
index 9da8485014..1bdd8bede4 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -609,7 +609,10 @@ TypeTableEntry *get_array_type(CodeGen *g, TypeTableEntry *child_type, uint64_t
     buf_resize(&entry->name, 0);
     buf_appendf(&entry->name, "[%" ZIG_PRI_u64 "]%s", array_size, buf_ptr(&child_type->name));
 
-    if (!entry->zero_bits) {
+    if (entry->zero_bits) {
+        entry->di_type = ZigLLVMCreateDebugArrayType(g->dbuilder, 0,
+                0, child_type->di_type, 0);
+    } else {
         entry->type_ref = child_type->type_ref ? LLVMArrayType(child_type->type_ref,
                 (unsigned int)array_size) : nullptr;
 
diff --git a/test/cases/var_args.zig b/test/cases/var_args.zig
index 7d16106362..aa8b210ad6 100644
--- a/test/cases/var_args.zig
+++ b/test/cases/var_args.zig
@@ -79,3 +79,11 @@ fn assertSlicePtrsEql(args: ...) {
     assert(s1.ptr == s2.ptr);
 }
 
+
+test "pass zero length array to var args param" {
+    doNothingWithFirstArg("");
+}
+
+fn doNothingWithFirstArg(args: ...) {
+    const a = args[0];
+}