error[E0531]: cannot find tuple struct or tuple variant `Ok` in this scope
   --> /Users/ericarellano/.cargo/registry/src/github.com-1ecc6299db9ec823/autocfg-1.1.0/src/lib.rs:440:16
    |
440 |         if let Ok(rustflags) = env::var("RUSTFLAGS") {
    |                ^^ not found in this scope

For more information about this error, try `rustc --explain E0463`.
error: could not compile `cfg-if` due to previous error
warning: build failed, waiting for other jobs to finish...
Some errors have detailed explanations: E0408, E0412, E0425, E0433, E0463, E0531.
For more information about an error, try `rustc --explain E0408`.
Some errors have detailed explanations: E0405, E0412, E0425, E0433, E0463, E0531.
For more information about an error, try `rustc --explain E0405`.
error: requires `sized` lang_item

error: could not compile `version_check` due to 79 previous errors
error: could not compile `autocfg` due to 99 previous errors
Some errors have detailed explanations: E0412, E0425, E0463, E0531.
For more information about an error, try `rustc --explain E0412`.
Some errors have detailed explanations: E0405, E0412, E0425, E0463, E0531.
error: could not compile `syn` due to 14 previous errors
Some errors have detailed explanations: E0412, E0463, E0531.
error: could not compile `proc-macro2` due to 31 previous errors
error: could not compile `unicode-xid` due to 2 previous errors
error: could not compile `libc` due to 55 previous errors