It's possible you're thinking of a different poem, or perhaps a different poet altogether. To help me give you a relevant answer, could you please clarify:
* Is the poem title correct? If not, what is the actual title?
* Are you sure the poet is Edwin Arlington Robinson? If not, who is the author?
Once I have this information, I can provide you with a detailed analysis of how the poet's use of language and imagery contributes to the poem's meaning.