Escape characters inside a single quoted literal ENV variable are not being handled

[rcjsuen]

FROM alpine
ENV var='\'
ENV var2='\\'

Hovering over var shows nothing and hovering over var2 shows \ instead of \\.

var should be \ and var2 should be \\ as shown in the following Docker build.

$ docker build .
Sending build context to Docker daemon  86.15MB
Step 1/5 : FROM alpine
 ---> 7328f6f8b418
Step 2/5 : ENV var '\'
 ---> Running in cd30a6e7e6ac
 ---> b8fdb94dfe21
Removing intermediate container cd30a6e7e6ac
Step 3/5 : ENV var2 '\\'
 ---> Running in cea00fe3b7b4
 ---> 419820fdd4a6
Removing intermediate container cea00fe3b7b4
Step 4/5 : RUN echo $var
 ---> Running in 15a4c3ea4df0
\
 ---> 83d6fc623f48
Removing intermediate container 15a4c3ea4df0
Step 5/5 : RUN echo $var2
 ---> Running in 5d245e2b2326
\\
 ---> f26a07c2caa9
Removing intermediate container 5d245e2b2326
Successfully built f26a07c2caa9