codegen/src/main/java/software/amazon/awssdk/codegen/poet/builder/SyncClientBuilderClass.java [141:152]:
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    private MethodSpec tokenProviderMethodImpl() {
        ParameterizedTypeName tokenProviderTypeName = ParameterizedTypeName.get(ClassName.get(IdentityProvider.class),
                                                                                WildcardTypeName.subtypeOf(TokenIdentity.class));
        return MethodSpec.methodBuilder("tokenProvider").addModifiers(Modifier.PUBLIC)
                         .addAnnotation(Override.class)
                         .addParameter(tokenProviderTypeName, "tokenProvider")
                         .returns(builderClassName)
                         .addStatement("clientConfiguration.option($T.TOKEN_IDENTITY_PROVIDER, tokenProvider)",
                                       AwsClientOption.class)
                         .addStatement("return this")
                         .build();
    }
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codegen/src/main/java/software/amazon/awssdk/codegen/poet/builder/AsyncClientBuilderClass.java [149:160]:
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    private MethodSpec tokenProviderMethod() {
        ParameterizedTypeName tokenProviderTypeName = ParameterizedTypeName.get(ClassName.get(IdentityProvider.class),
                                                                                WildcardTypeName.subtypeOf(TokenIdentity.class));
        return MethodSpec.methodBuilder("tokenProvider").addModifiers(Modifier.PUBLIC)
                         .addAnnotation(Override.class)
                         .addParameter(tokenProviderTypeName, "tokenProvider")
                         .returns(builderClassName)
                         .addStatement("clientConfiguration.option($T.TOKEN_IDENTITY_PROVIDER, tokenProvider)",
                                       AwsClientOption.class)
                         .addStatement("return this")
                         .build();
    }
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