Spaces after variables cause them to not get resolved correctly

[rcjsuen]

It seems that variables that have a space after them can confuse the parser. Although the last variable gets correctly resolved, the two variables in the front don't get any textDocument/hover information and so forth.

FROM scratch
ENV aaa=bbb
LABEL k1="$aaa $aaa $aaa"
LABEL k2='$aaa $aaa $aaa'

$ docker build .
Sending build context to Docker daemon  1.571MB
Step 1/4 : FROM scratch
 --->
Step 2/4 : ENV aaa bbb
 ---> Running in e20b517a0ba8
 ---> 14c47eda1d99
Removing intermediate container e20b517a0ba8
Step 3/4 : LABEL k1 "$aaa $aaa $aaa"
 ---> Running in 59f69181ac0d
 ---> f549709b1a58
Removing intermediate container 59f69181ac0d
Step 4/4 : LABEL k2 '$aaa $aaa $aaa'
 ---> Running in 151add14a98a
 ---> e8d1a3eb3c7c
Removing intermediate container 151add14a98a
Successfully built e8d1a3eb3c7c

$ docker inspect e8d1a3eb3c7c
"Labels": {
  "k1": "bbb bbb bbb",
  "k2": "$aaa $aaa $aaa"
}