Added error for unhandled error types.

[orizi]

Closes #3960.

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Stack:

• Added Entry alias and removed direct use. #4456
• Added error for unhandled error types. #4454 ⬅

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

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This change is 

[gilbens-starkware]

Reviewed 7 of 10 files at r1, all commit messages.
Reviewable status: 7 of 10 files reviewed, 1 unresolved discussion (waiting on @orizi)

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crates/cairo-lang-semantic/src/expr/compute.rs line 2081 at r1 (raw file):

                && unwrap_error_propagation_type(ctx.db, ty).is_some()
            {
                ctx.diagnostics.report(&expr_syntax, UnhandledErrorType { ty });

The author talked about a warning, do we really want to error on this?

[orizi]

Reviewable status: 7 of 10 files reviewed, 1 unresolved discussion (waiting on @gilbens-starkware)

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crates/cairo-lang-semantic/src/expr/compute.rs line 2081 at r1 (raw file):

Previously, gilbens-starkware (Gil Ben-Shachar) wrote…

The author talked about a warning, do we really want to error on this?

why not - you can handle it by:
let _ =

[gilbens-starkware]

Reviewed 4 of 10 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @orizi)