Hmbown/CodeWhale · error · ValueError

provider!() invocations returned no providers

Error message

provider!() invocations returned no providers

What it means

provider_kind_ids() finishes by asserting it actually extracted at least one variant→id pair from the provider!() invocations. This error means the regex found zero provider!() calls, i.e. the function read a source where the registry macro invocations are absent entirely — the guard is reading the wrong file or the registry format changed wholesale.

Solutions

1. Point the guard's source path (PROVIDER_RS / config source) at the file that actually contains the provider!() invocations
2. Update the provider!() regex in provider_kind_ids to match the current macro call format
3. Verify the repository checkout is complete and the registry file is non-empty before running the guard

Example fix

// before: PROVIDER_RS points to old config/providers.rs (moved in split)
// after:  PROVIDER_RS = REPO / "crates" / "config" / "src" / "provider_kind.rs" (or the file now holding provider!() calls)

import re
if not re.findall(r'provider!\(', provider_rs):
    print("no provider!() invocations found; check source path")

try:
    ids = provider_kind_ids(provider_rs)
except ValueError as e:
    print(f"registry source unusable: {e}", file=sys.stderr)
    sys.exit(1)

When it happens

Trigger: Called from api_provider_ids or main when re.findall over the source for provider!(...) invocations returns nothing — the file passed for provider_rs has no matching invocations (wrong path, empty read, or macro call format no longer matches the regex).

Common situations: The config module split moved provider registrations to a different file and the guard's path constant is stale; the provider! macro call syntax changed (different arg layout/whitespace); running the script from a checkout where the registry file is empty or missing.

Understand the failure class

Background: EmptyResultError / "no results found": when an API or scraper succeeds but returns zero rows — this error's family across 9 libraries.

Related errors

• : missing parse arm for
• expected a hand-written `impl Provider for
• : missing
• could not parse match block after
• baseline receipt does not match baseline_observation

AI-assisted analysis of Hmbown/CodeWhale@433685b202 (2026-09-15). Data as JSON: /api/errors/f1ac2e6d7c75698a. Report an issue: GitHub.

Appendix: source

Thrown at scripts/check-provider-registry.py:203

        # the wire policy is not fixed, so provider!() cannot express them.
        ("ModelstudioTokenPlan", "modelstudio-token-plan"),
        ("ModelstudioTokenPlanAnthropic", "modelstudio-token-plan-anthropic"),
        ("ModelstudioCodingPlan", "modelstudio-coding-plan"),
        ("ModelstudioCodingPlanAnthropic", "modelstudio-coding-plan-anthropic"),
    ]:
        match = re.search(
            rf'impl\s+Provider\s+for\s+{variant_name}.*?fn\s+id.*?\"({id_literal})\"',
            provider_rs, re.DOTALL,
        )
        if match:
            ids[variant_name] = match.group(1)
        elif variant_name not in ids:
            raise ValueError(
                f"expected a hand-written `impl Provider for {variant_name}` "
                f"with id {id_literal!r}; the guard's floor is stale"
            )
    if not ids:
        raise ValueError("provider!() invocations returned no providers")
    return ids


def provider_kind_catalog_ids(
    provider_kind_rs: str, variant_to_id: dict[str, str]
) -> set[str]:
    catalog = re.search(
        r"pub const ALL:\s*\[Self;\s*\d+\]\s*=\s*\[(.*?)\];",
        provider_kind_rs,
        flags=re.DOTALL,
    )
    if catalog is None:
        raise ValueError("crates/config/src/provider_kind.rs: missing ProviderKind::ALL")
    variants = set(re.findall(r"Self::(\w+)", catalog.group(1)))
    catalog_variant_to_id = {**variant_to_id, "Custom": "custom"}
    missing = variants - set(catalog_variant_to_id)
    if missing:
        raise ValueError(f"ProviderKind::ALL uses unknown variants: {sorted(missing)}")

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