no enum/decl literal completion in target expression of switch case

[FnControlOption]

Zig Version

0.15.0-dev.441+c1649d586

ZLS Version

0.15.0-dev.137+f6580bf8

Client / Code Editor / Extensions

vscode

Steps to Reproduce and Observed Behavior

const S = enum {
    a,
    b,

    const c: S = .a;
};

test {
    const x: S = switch (@as(u8, 42)) {
        0 => .<cursor>,
        1 => .b,
        else => .c,
    };
}

Expected Behavior

shows a, b, and c

Relevant log output

---

Upon further inspection, it appears the Zig parser does not create an AST node for the switch statement, which means we can't use ast.nodesOverlappingIndexIncludingParseErrors

An error tolerant version of the parseSwitchProng() call in the parser might look like this:

const maybe_item = p.parseSwitchProng() catch |err| switch (err) {
    error.OutOfMemory => return error.OutOfMemory,
    error.ParseError => {
        p.findNextSwitchProng();
        continue;
    },
};
const item = maybe_item orelse break;

Then we can check for a => token to the left of the enum/decl literal and use the switch condition for type resolution