TypeShade
Rule 12.2
Chapter 12, Diagnostics Review
A code must be TS8 followed by a sequential number in the order codes were added, or a number from a block handed to a parallel branch (Rule 3.7), whose unused numbers stay a gap.
TS8099 is the catch-all for a site that does not yet deserve its own code, and a refusal that has a reason must leave it.
The rule text and the parts under it are the compiler's own English, as the design document writes them.
Rationale
a stable code is what a test, an issue, and a language service filter key on.
Derives from
the head comment of src/compiler/ts/codes.ts; surface §28 (roadmap 0.3 item T10, “in place of TS8099 Unsupported expression”).
How it is verified
Held by review. No file checks it, and the rule names review as what holds it.
Where the rule says the compiler enforces it:
review against Rule 3.7.
Explained in
The sections of the surface document that explain this rule, at commit 26de7be8:
See also
Source
The rule at commit 26de7be8:
docs/language-design.md:1232(the design document)reqs/rules/RULE-1202.md(its traceability item)