Stop warnings from running the test case requiring .so twice #9246
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After the merge of #8991 (Feature 2005), it causes warnings about method re-definitions.
Without this patch, the extension defined methods before resolving symbols. But when resolving symbols causes LoadError, retries of
require "resolve_symbol_resolver.so"
will callrb_define_singleton_method
again and it causes warnings.This patch resolves this problem. The comment could be a valuable guide example for the future when extension developers use
rb_ext_resolve_symbol
in their extensions.