Program Reference: Diagnostics and Invalid Programs

This page covers user-visible parser diagnostics and common invalid program shapes.

Parser Diagnostics Highlights

Implemented checks include:

• block length limit: 512 chars including LF
• invalid skip-level value (/0.. /9 enforced)
• invalid or misplaced N address words
• duplicate N warning when line-number jumps are present
• G4 block-shape checks
• assignment-shape baseline (AP90 rejected; AP=90, X1=10 accepted)

Use the requirements and SPEC pages for the broader diagnostic contract:

• G-code Syntax Requirements
• G-code Semantic Validation Requirements
• SPEC: Diagnostics and Lowering