[chore] test that implementation implements interface without allocat…

…ion (open-telemetry#10214)

otelcol/configprovider.go

@@ -67,8 +67,8 @@ type configProvider struct {
 	mapResolver *confmap.Resolver
 }
 
-var _ ConfigProvider = &configProvider{}
-var _ ConfmapProvider = &configProvider{}
+var _ ConfigProvider = (*configProvider)(nil)
+var _ ConfmapProvider = (*configProvider)(nil)
 
 // ConfigProviderSettings are the settings to configure the behavior of the ConfigProvider.
 type ConfigProviderSettings struct {

service/internal/graph/graph_test.go

@@ -34,7 +34,7 @@ import (
 	"go.opentelemetry.io/collector/service/pipelines"
 )
 
-var _ component.Component = &testNode{}
+var _ component.Component = (*testNode)(nil)
 
 type testNode struct {
 	id          component.ID

service/internal/graph/nodes.go

@@ -104,7 +104,7 @@ func (n *receiverNode) buildComponent(ctx context.Context,
 	return nil
 }
 
-var _ consumerNode = &processorNode{}
+var _ consumerNode = (*processorNode)(nil)
 
 // Every processor instance is unique to one pipeline.
 // Therefore, nodeID is derived from "pipeline ID" and "component ID".
@@ -152,7 +152,7 @@ func (n *processorNode) buildComponent(ctx context.Context,
 	return nil
 }
 
-var _ consumerNode = &exporterNode{}
+var _ consumerNode = (*exporterNode)(nil)
 
 // An exporter instance can be shared by multiple pipelines of the same type.
 // Therefore, nodeID is derived from "pipeline type" and "component ID".
@@ -200,7 +200,7 @@ func (n *exporterNode) buildComponent(
 	return nil
 }
 
-var _ consumerNode = &connectorNode{}
+var _ consumerNode = (*connectorNode)(nil)
 
 // A connector instance connects one pipeline type to one other pipeline type.
 // Therefore, nodeID is derived from "exporter pipeline type", "receiver pipeline type", and "component ID".
@@ -347,7 +347,7 @@ func (n *connectorNode) buildComponent(
 	return nil
 }
 
-var _ consumerNode = &capabilitiesNode{}
+var _ consumerNode = (*capabilitiesNode)(nil)
 
 // Every pipeline has a "virtual" capabilities node immediately after the receiver(s).
 // There are two purposes for this node:
@@ -374,7 +374,7 @@ func (n *capabilitiesNode) getConsumer() baseConsumer {
 	return n
 }
 
-var _ consumerNode = &fanOutNode{}
+var _ consumerNode = (*fanOutNode)(nil)
 
 // Each pipeline has one fan-out node before exporters.
 // Therefore, nodeID is derived from "pipeline ID".