Small script fixes (Make which truly silent and make start_lexical.sh symbolic-link friendly) #2608

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4 errors and 5 warnings

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** (SyntaxError) lib/parse_errors.ex:15:3: unexpected reserved word: end

** (SyntaxError) lib/compilation_errors.ex:4:3: unexpected reserved word: end

The operation was canceled.

use Bitwise is deprecated. import Bitwise instead

Supervisor.Spec.worker/2 is deprecated. Use the new child specifications outlined in the Supervisor module instead

variable "x" is unused (if the variable is not meant to be used, prefix it with an underscore)

variable "b" is unused (if the variable is not meant to be used, prefix it with an underscore)

variable "a" is unused (if the variable is not meant to be used, prefix it with an underscore)