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syntax docker
list -i instruction \
ADD CMD COPY ENTRYPOINT ENV EXPOSE FROM MAINTAINER ONBUILD RUN \
USER VOLUME WORKDIR
state start
char -b a-zA-Z ident
char # comment
char -n " \t\n" bad
eat this
state ident
char -b a-zA-Z this
char -bn " \t\n" bad error
inlist instruction arguments keyword
noeat -b bad
state arguments
str "\\\n" this
char "\n" start
eat this
state comment
char "\n" start
eat this
state bad error
recolor error
char " \t" arguments
char "\n" start
eat this
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