Jamie (Dec 09 2025 at 17:03): Jamie (Dec 09 2025 at 17:03):I have a roc file called main.roc, and when I try to run it with roc run ./main.roc (compiled from this commit), I get the error:
thread 27610 panic: index out of bounds: index 2863311530, len 1611
/home/jg/roc/src/types/instantiate.zig:341:60: 0x54b53c7 in instantiateTagUnion (mod.zig)
const arg_var = self.store.vars.items.items[args_start + i];
^
/home/jg/roc/src/types/instantiate.zig:227:90: 0x53cea36 in instantiateFlatType (mod.zig)
.tag_union => |tag_union| FlatType{ .tag_union = try self.instantiateTagUnion(tag_union) },
^
/home/jg/roc/src/types/instantiate.zig:183:69: 0x52839d8 in instantiateContent (mod.zig)
const fresh_flat_type = try self.instantiateFlatType(flat_type);
^
/home/jg/roc/src/types/instantiate.zig:152:66: 0x509881f in instantiateVar (mod.zig)
const fresh_content = try self.instantiateContent(resolved.desc.content);
^
/home/jg/roc/src/types/instantiate.zig:357:43: 0x54b5f0d in instantiateTagUnion (mod.zig)
.ext = try self.instantiateVar(tag_union.ext),
^
/home/jg/roc/src/types/instantiate.zig:227:90: 0x53cea36 in instantiateFlatType (mod.zig)
.tag_union => |tag_union| FlatType{ .tag_union = try self.instantiateTagUnion(tag_union) },
^
/home/jg/roc/src/types/instantiate.zig:183:69: 0x52839d8 in instantiateContent (mod.zig)
const fresh_flat_type = try self.instantiateFlatType(flat_type);
^
/home/jg/roc/src/types/instantiate.zig:152:66: 0x509881f in instantiateVar (mod.zig)
const fresh_content = try self.instantiateContent(resolved.desc.content);
^
/home/jg/roc/src/types/instantiate.zig:212:58: 0x53cda4a in instantiateAlias (mod.zig)
const fresh_backing_var = try self.instantiateVar(backing_var);
^
/home/jg/roc/src/types/instantiate.zig:179:49: 0x52838a8 in instantiateContent (mod.zig)
return try self.instantiateAlias(alias);
^
/home/jg/roc/src/types/instantiate.zig:152:66: 0x509881f in instantiateVar (mod.zig)
const fresh_content = try self.instantiateContent(resolved.desc.content);
^
/home/jg/roc/src/types/instantiate.zig:342:58: 0x54b5419 in instantiateTagUnion (mod.zig)
const fresh_arg = try self.instantiateVar(arg_var);
^
/home/jg/roc/src/types/instantiate.zig:227:90: 0x53cea36 in instantiateFlatType (mod.zig)
.tag_union => |tag_union| FlatType{ .tag_union = try self.instantiateTagUnion(tag_union) },
^
/home/jg/roc/src/types/instantiate.zig:183:69: 0x52839d8 in instantiateContent (mod.zig)
const fresh_flat_type = try self.instantiateFlatType(flat_type);
^
/home/jg/roc/src/types/instantiate.zig:152:66: 0x509881f in instantiateVar (mod.zig)
const fresh_content = try self.instantiateContent(resolved.desc.content);
^
/home/jg/roc/src/types/instantiate.zig:234:58: 0x54b20ad in instantiateNominalType (mod.zig)
const fresh_backing_var = try self.instantiateVar(backing_var);
^
/home/jg/roc/src/types/instantiate.zig:220:97: 0x53ce0cf in instantiateFlatType (mod.zig)
.nominal_type => |nominal| FlatType{ .nominal_type = try self.instantiateNominalType(nominal) },
^
/home/jg/roc/src/types/instantiate.zig:183:69: 0x52839d8 in instantiateContent (mod.zig)
const fresh_flat_type = try self.instantiateFlatType(flat_type);
^
/home/jg/roc/src/types/instantiate.zig:152:66: 0x509881f in instantiateVar (mod.zig)
const fresh_content = try self.instantiateContent(resolved.desc.content);
^
/home/jg/roc/src/check/Check.zig:545:61: 0x4da5790 in instantiateVarHelp (mod.zig)
const instantiated_var = try instantiator.instantiateVar(var_to_instantiate);
^
/home/jg/roc/src/check/Check.zig:490:35: 0x4b71fb8 in instantiateVar (mod.zig)
return self.instantiateVarHelp(var_to_instantiate, &instantiate_ctx, env, region_behavior);
^
/home/jg/roc/src/check/Check.zig:3093:61: 0x4b245fb in checkExpr (mod.zig)
const instantiated = try self.instantiateVar(pat_var, env, .use_last_var);
^
/home/jg/roc/src/check/Check.zig:2829:45: 0x4b2103e in checkExpr (mod.zig)
does_fx = try self.checkExpr(single_elem_expr_idx, env, .no_expectation) or does_fx;
^
/home/jg/roc/src/check/Check.zig:3351:53: 0x4b27fdd in checkExpr (mod.zig)
does_fx = try self.checkExpr(call_arg_idx, env, .no_expectation) or does_fx;
^
/home/jg/roc/src/check/Check.zig:4262:37: 0x4d86564 in checkMatchExpr (mod.zig)
var does_fx = try self.checkExpr(match.cond, env, .no_expectation);
^
/home/jg/roc/src/check/Check.zig:3547:46: 0x4b2a6b0 in checkExpr (mod.zig)
does_fx = try self.checkMatchExpr(expr_idx, env, match) or does_fx;
^
/home/jg/roc/src/check/Check.zig:3843:49: 0x4d7ea0b in checkBlockStatements (mod.zig)
does_fx = try self.checkExpr(decl_stmt.expr, env, expectation) or does_fx;
^
/home/jg/roc/src/check/Check.zig:3137:62: 0x4b24f98 in checkExpr (mod.zig)
const stmt_result = try self.checkBlockStatements(statements, env, expr_region);
^
/home/jg/roc/src/check/Check.zig:4317:37: 0x4d87227 in checkMatchExpr (mod.zig)
does_fx = try self.checkExpr(branch.value, env, .no_expectation) or does_fx;
^
/home/jg/roc/src/check/Check.zig:3547:46: 0x4b2a6b0 in checkExpr (mod.zig)
does_fx = try self.checkMatchExpr(expr_idx, env, match) or does_fx;
^
/home/jg/roc/src/check/Check.zig:3141:41: 0x4b250e7 in checkExpr (mod.zig)
does_fx = try self.checkExpr(block.final_expr, env, expected) or does_fx;
^
/home/jg/roc/src/check/Check.zig:3299:49: 0x4b272d2 in checkExpr (mod.zig)
does_fx = try self.checkExpr(lambda.body, env, .no_expectation) or does_fx;
^
/home/jg/roc/src/check/Check.zig:3331:41: 0x4b27b9e in checkExpr (mod.zig)
does_fx = try self.checkExpr(closure.lambda_idx, env, expected) or does_fx;
^
/home/jg/roc/src/check/Check.zig:1247:35: 0x4b19f77 in checkDef (mod.zig)
_ = try self.checkExpr(def.expr, env, .no_expectation);
^
/home/jg/roc/src/check/Check.zig:1026:26: 0x48ddc51 in checkFile (mod.zig)
try self.checkDef(def_idx, &env);
^
/home/jg/roc/src/cli/main.zig:1862:30: 0x458872d in setupSharedMemoryWithModuleEnv (main.zig)
try app_checker.checkFile();
^
/home/jg/roc/src/cli/main.zig:1109:54: 0x4595f9f in rocRun (main.zig)
const shm_result = setupSharedMemoryWithModuleEnv(allocs, args.path, args.allow_errors) catch |err| {
^
/home/jg/roc/src/cli/main.zig:680:23: 0x4836a05 in mainArgs (main.zig)
try rocRun(allocs, run_args);
^
/home/jg/roc/src/cli/main.zig:619:13: 0x4838fb8 in main (main.zig)
mainArgs(&allocs, args) catch {
^
/home/jg/binary-repository/downloadedSources/zig/lib/std/start.zig:627:37: 0x4839571 in main (std.zig)
const result = root.main() catch |err| {
^
/home/jg/binary-repository/downloadedSources/zig/lib/libc/musl/src/env/__libc_start_main.c:95:7: 0x9437d9d in libc_start_main_stage2 (/home/jg/binary-repository/downloadedSources/zig/lib/libc/musl/src/env/__libc_start_main.c)
exit(main(argc, argv, envp));
^
???:?:?: 0x9433349 in ??? (???)
Unwind error at address `exe:0x9433349` (error.MissingFDE), trace may be incomplete
Aborted (core dumped) ~/roc/zig-out/bin/roc run ./main2.roc
I don’t think there is a run subcommand. It would be roc main.roc directly.
Jamie (Dec 09 2025 at 17:07):roc run seems to work the same as just roc
Matthieu Pizenberg (Dec 09 2025 at 17:09):I see you are calling File.read_utf8 but I don’t think the temporary platform made for AoC by @Luke Boswell has file IO yet.
Anton (Dec 09 2025 at 17:22):Yeah, no File support yet
Jamie (Dec 09 2025 at 17:31):Yeah, my program is really bad right now, and it probably has lots of bugs in it. One of the issues is using unimplemented things like file reading/writing, Inspect.to_str, and Num.to_str. But the new compiler should still be able to always either run a program or give a list of errors that the program has.
Jamie (Dec 09 2025 at 17:32):And this bug stops that from working
Anton (Dec 09 2025 at 17:54):Agreed :)
Can you make a github issue?
Jamie (Dec 09 2025 at 18:34):Here is the issue I've created https://github.com/roc-lang/roc/issues/8599
Last updated: Dec 21 2025 at 12:15 UTC