CSS custom properties with rgba cause an error

[ArielGueta]

Using CSS custom properties with rgba in scss files cause an error when trying to compile it.

Example code:

.foo {
  color: rgba(var(--colorvar), 1)
}

Error: argument $color of rgba($color, $alpha) must be a color

$ node-sass --version
node-sass 4.7.2 (Wrapper) [JavaScript]
libsass 3.5.0.beta.2 (Sass Compiler) [C/C++]

[nschonni]

This is resolved in #2244 but node-sass hasn't been updated to use a version of libsass that includes the patch

[mgreter]

AFAICS this was not correctly resolved for this case ...

[xzyfer]

@mgreter is correct. The short-hand signature for rgba was not covered in #2244 by mistake. This is addressed in #2564