// We can't use the key of the fallback toolchain spec, because it is a spec that can match configured requests as well
        JavaToolchainSpecInternal.Key actualKey = useFallback ? FALLBACK_TOOLCHAIN_KEY : requestedSpec.toKey();

        Object resolutionResult = matchingToolchains.computeIfAbsent(actualKey, key -> {
            try {
                return query(actualSpec, useFallback);
            } catch (Exception e) {

					res[fromKey] = map[Reference]*Grants{}
				}
				if _, f := res[fromKey][toKey]; !f {
					res[fromKey][toKey] = &Grants{
						AllowedNames: sets.New[string](),
					}
				}
				if to.Name != nil {
					res[fromKey][toKey].AllowedNames.Insert(string(*to.Name))
				} else {
					res[fromKey][toKey].AllowAll = true
				}
			}
		}
	}
	return res
}