Zig segfaults when compiling: runtime struct input to type returning function

[dimchee]

Zig Version

0.14.1

Steps to Reproduce and Observed Behavior

The following minimal snippet reproduces the issue:

fn Fn(x: struct { []const u8, type }) type {
    _ = x;
    return struct {};
}

pub fn main() void {
    var runtime_val: []const u8 = "true";
    runtime_val = "false";
    const T = Fn(.{ runtime_val, struct {} });
    _ = T;
}

$ zig run problem.zig
Segmentation fault (core dumped)

Expected Behavior

Code should not compile, and return a helpful error message:

$ zig run problem.zig 
problem.zig:9:18: error: unable to resolve comptime value
    const T = Fn(.{ runtime_val, struct {} });
                 ^~~~~~~~~~~~~~~~~~~~~~~
problem.zig:9:17: note: call to function with comptime-only return type 'type' is evaluated at comptime
    const T = Fn(.{ runtime_val, struct {} });
              ~~^~~~~~~~~~~~~~~~~~~~~~
problem.zig:1:22: note: return type declared here
fn Fn(x: struct { []const u8, type }) type {
                                                     ^~~~
problem.zig:9:17: note: types are not available at runtime
    const T = Fn(.{ runtime_val, struct {} });
              ~~^~~~~~~~~~~~~~~~~~~~~~