Diagnostics

Compiler codes are stable by phase: Wiz1xxx lexer, Wiz2xxx parser, Wiz3xxx binding, Wiz4xxx type checking, and Wiz5xxx project/emission. Configuration uses WIZCFGxxx.

Example:

src/main.wiz:12:14 WIZ4001 Argument 1 of start_server expects string, but received int

Diagnostics contain source filename, half-open offset range, severity, phase, code, and message. The language service deduplicates reports by file/range/code before translating them to LSP.

The initial lexer recovery codes are:

Code	Meaning
WIZ1001	A single- or double-quoted token is unfinished.
WIZ1002	A parameter, command, or arithmetic expansion is unfinished.
WIZ1003	A heredoc terminator is missing.

Recovery diagnostics do not discard source text. The lossless tree retains the incomplete token or heredoc body so formatting, highlighting, and subsequent edits continue to work in the editor.