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Duplicate stage names are not allowed.
Superseded by buildkit/DuplicateStageName, which provides the same check.
Description
Defining multiple stages with the same name results in an error because the builder is unable to uniquely resolve the stage name reference.
Examples
Problematic code
FROM debian:latest AS builder
RUN apt-get update
FROM golang:latest AS builder
Correct code
FROM debian:latest AS deb-builder
RUN apt-get update
FROM golang:latest AS go-builder
Reference