Option Explicit
Flags modules that omit Option Explicit.
Reasoning
This option makes variable declarations mandatory. Without it, a typo gets compiled as a new on-the-spot Variant/Empty variable with a new name. Omitting this option amounts to refusing the little help the VBE can provide with compile-time validation.
Default severity
Error
Inspection type
CodeQualityIssues
Examples
This example should trigger a result
This example should NOT trigger a result
Rubberduck.CodeAnalysis.Inspections.Concrete.OptionExplicitInspection.cs (Prerelease-v2.5.9.6289)