SIFR-CALL-0004: Missing required argument. - Sifr

SIFR-CALL-0004 belongs to the Function and method calls diagnostic family. It means: missing required argument.

Why It Happens

The call site does not match the callable signature Sifr inferred or checked. Fix the number of arguments, names, types, or overload selection.

Use sifr --explain SIFR-CALL-0004 locally to see the renderer’s exact message template and any machine-applicable suggestions for the compiler version you are running.

Erroneous Code

def greet(name: str) -> str:
    return "hi " + name

message = greet()

How To Fix It

Make the call match the function signature: provide required arguments once, use known keyword names, and call only callable values.

Fixed Code

def greet(name: str) -> str:
    return "hi " + name

message = greet("Sifr")

Details

Field	Value
Code	`SIFR-CALL-0004`
Family	`CALL`
Severity	Error
Stability	stable
Owner	`sifr_lowering::lower`
Representative fixture	`crates/sifr/tests/e2e/fail/missing_required_argument.sifr`

See the Error Codes index for the complete catalog.