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Duplicate stage names are not allowed.
Superseded by buildkit/DuplicateStageName, which provides the same check.

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Description

Defining multiple stages with the same name results in an error because the builder is unable to uniquely resolve the stage name reference.

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Examples

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Problematic code

FROM debian:latest AS builder
RUN apt-get update

FROM golang:latest AS builder

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Correct code

FROM debian:latest AS deb-builder
RUN apt-get update

FROM golang:latest AS go-builder

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Reference