Compiler Error Index

Each diagnostic emitted from the compiler has a unique error number of the form SCMXXX where XXX is the error number. Error numbers are grouped into ‘categories’ based on the phase in the compiler that emitted the diagnostic.

Currently the diagnostic categories are:

• 1-9 - Legacy syntax errors.
• 10-19 - Parser and read.
• 20-29 - Library declaration and use.
• 30-39 - Binder diagnostics.
• 40-49 - Macro definition and expansion.

TODO: Fill out the index with the current errors for reference.