VBC09319 — Duplicate label definition

Severity: Error · Family: VBC (static semantics / abstract syntax tree) · Source metadata: VBCompileErrorInfo

A procedure body defines the same line label or line number more than once. A procedure declaration must contain exactly one definition of each label value it declares (MS-VBAL §5.4.1.1 Statement Labels).

This code is raised by instruction-list lowering (RD-VBAL §3.5.3 Lowering Block Statements), which builds the label table a jump statement's target resolves against. Lowering needs every label to resolve to a single, unambiguous offset.

The verbose detail names the label that was defined more than once.

How it is raised

Situation	Example	Resolution
The same identifier labels two different statements in one procedure.	`Top:` ... `Top:`	Rename one of the labels, or remove the duplicate.
The same line number labels two different statements in one procedure.	`100:` ... `100:`	Renumber one of the lines, or remove the duplicate.
Two labels differing only by case.	`Top:` ... `TOP:`	Label names are not case-sensitive: this is the same label defined twice.

Notes

Only the first definition of a repeated label is kept: it is the one every jump to that label resolves against.

A label that a jump names but that the procedure does not define at all is a different condition, VBC09309, and is not reported by this code.

Table of Contents

VBC09319 — Duplicate label definition

How it is raised

Notes

See also