Non-comptime switch cases not allowed

build.log

$ zig test src/main.zig 
./src/main.zig:11:28: error: cannot store runtime value in compile time variable
            const d: u32 = c;
                           ^

main.zig

const std = @import("std");
const expect = std.testing.expect;

test "switch" {
    const a: u64 = 105;
    var c: u32 = 5;
    const b = switch (a) {
        1, 2, 3 => 0,
        5...100 => 1,
        blk: {
            const d: u32 = c;
            const e: u32 = 100;
            break :blk d + e;
        } => 7,
        else => 9,
    };
    try expect(b == 7);
}