e9bd2d45d4
This rewrite improves some error messages, hugely simplifies the logic, and fixes several bugs. One of these bugs is technically a new rule which Andrew and I agreed on: if a parameter has a comptime-only type but is not declared `comptime`, then the corresponding call argument should not be *evaluated* at comptime; only resolved. Implementing this required changing how function types work a little, which in turn required allowing a new kind of function coercion for some generic use cases: function coercions are now allowed to implicitly *remove* `comptime` annotations from parameters with comptime-only types. This is okay because removing the annotation affects only the call site. Resolves: #22262
49 lines
1.3 KiB
Zig
49 lines
1.3 KiB
Zig
const S = struct {
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fnPtr: fn () void,
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};
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fn bar() void {}
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fn baz() void {}
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var runtime: bool = true;
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fn ifExpr() S {
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if (runtime) {
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return .{
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.fnPtr = bar,
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};
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} else {
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return .{
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.fnPtr = baz,
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};
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}
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}
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pub export fn entry1() void {
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_ = ifExpr();
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}
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fn switchExpr() S {
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switch (runtime) {
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true => return .{
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.fnPtr = bar,
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},
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false => return .{
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.fnPtr = baz,
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},
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}
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}
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pub export fn entry2() void {
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_ = switchExpr();
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}
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// error
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//
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// :8:9: error: unable to resolve comptime value
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// :19:15: note: called at comptime from here
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// :19:15: note: call to function with comptime-only return type 'tmp.S' is evaluated at comptime
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// :7:13: note: return type declared here
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// :2:12: note: struct requires comptime because of this field
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// :2:12: note: use '*const fn () void' for a function pointer type
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// :22:13: error: unable to resolve comptime value
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// :32:19: note: called at comptime from here
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// :32:19: note: call to function with comptime-only return type 'tmp.S' is evaluated at comptime
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// :21:17: note: return type declared here
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// :2:12: note: struct requires comptime because of this field
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// :2:12: note: use '*const fn () void' for a function pointer type
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