SIFR-TYPE-0010: TypeVar constraints are not satisfied by the inferred concrete type. - Sifr

SIFR-TYPE-0010 belongs to the Static typing diagnostic family. It means: typeVar constraints are not satisfied by the inferred concrete type.

Why It Happens

Static types do not line up. Align annotations, inferred expressions, branches, containers, operators, or generic constraints, and convert explicitly where needed.

Use sifr --explain SIFR-TYPE-0010 locally to see the renderer’s exact message template and any machine-applicable suggestions for the compiler version you are running.

Erroneous Code

count: int = "three"

How To Fix It

Make annotations, inferred values, branch results, container elements, and operator operands agree. Add explicit conversions where the conversion is meaningful.

Fixed Code

count: int = 3

Details

Field	Value
Code	`SIFR-TYPE-0010`
Family	`TYPE`
Severity	Error
Stability	stable
Owner	`sifr_lowering::lower::expressions`
Representative fixture	`crates/sifr/tests/e2e/fail/typevar_constraints_violation.sifr`

See the Error Codes index for the complete catalog.