diff --git a/stage0/astgen.c b/stage0/astgen.c
index 932ab55cd5..b6462a5463 100644
--- a/stage0/astgen.c
+++ b/stage0/astgen.c
@@ -9924,17 +9924,8 @@ static uint32_t forExpr(
                 lens[i][1] = end_val;
             }
 
-            // Check if start is trivially zero.
-            bool start_is_zero = false;
-            if (tree->nodes.tags[start_node] == AST_NODE_NUMBER_LITERAL) {
-                uint32_t tok = tree->nodes.main_tokens[start_node];
-                uint32_t ts = tree->tokens.starts[tok];
-                if (tree->source[ts] == '0'
-                    && (ts + 1 >= tree->source_len
-                        || tree->source[ts + 1] < '0'
-                        || tree->source[ts + 1] > '9'))
-                    start_is_zero = true;
-            }
+            // Check if start is trivially zero (AstGen.zig:6915).
+            bool start_is_zero = nodeIsTriviallyZero(tree, start_node);
             indexables[i] = start_is_zero ? ZIR_REF_NONE : start_val;
         } else {
             // Regular indexable (AstGen.zig:6918-6923).
diff --git a/stage0/stages_test.zig b/stage0/stages_test.zig
index d3465fb4ff..5666763b56 100644
--- a/stage0/stages_test.zig
+++ b/stage0/stages_test.zig
@@ -37,7 +37,7 @@ const corpus_files = .{
     "../lib/compiler/aro/aro/Builtins/TypeDescription.zig",
     "../lib/compiler/aro/aro/Builtins.zig",
     "../lib/compiler/aro/aro/char_info/identifier_tables.zig",
-    //"../lib/compiler/aro/aro/char_info.zig",
+    "../lib/compiler/aro/aro/char_info.zig",
     "../lib/compiler/aro/aro/CodeGen.zig",
     "../lib/compiler/aro/aro/Compilation.zig",
     "../lib/compiler/aro/aro/Diagnostics/messages.zig",