Evaluate an expression, exiting as soon as any errors are generated:

Create a robust function:

Process an error before returning:

Set f to "Expression" to propagate errors without wrapping in Failure:

The innermost Enclose has precedence:

Use a tag to pass an error to the outer Enclose:

Provide a constant function for f to return a fixed value in the event of any error:

Propagate errors up multiple levels:

Perform multiple confirmations by nesting confirms:

Safely call a function that could fail, propagating any errors unchanged:

Propagate missing values while calculating GDP per capita for every country:

Find all polyhedra that have edges between every pair of vertices, ignoring polyhedra where no BoundaryMeshRegion is available:

Catch[…,_] can intercept errors:

Enclose does not catch expressions thrown by Throw:

If no tag is provided, Enclose lexically replaces symbols like Confirm with lexically tagged variants: