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    environment {
        FOO = "bar"
        OTHER = "${FOO}baz"
    }

Firstly ${FOO} cannot work it is a groovy variable and it should be escaped

OTHER = "\${FOO}baz"

OTHER = '${FOO}baz'

And even by escaping it it's not working

and we have

[declarative-pipeline] Running shell script
+ printenv
...
OTHER=nullbaz
...
FOO=bar
...

note that FOO is seen as null which makes no sense in shell env (it should be empty if unknown.

cc abayer jglick rsandell (should it be considered as a bug ? Or an improvement to do ?)

is duplicated by

JENKINS-42666 wrong environment configuration in the syntax reference wiki page

JENKINS-41386 need to support or reject non string based environment variables.

JENKINS-41623 Variable Expansion in Global Variables Not Occurring

JENKINS-41890 Declarative syntax: ${env.WORKSPACE} not set in environment block

links to

CloudBees Internal OSS-1935

(2 links to)