Sema: fix runtime call of inline fn with comptime-known comptime-only ret type

Author: castholm

lib/std/math/nextafter.zig

@@ -144,7 +144,7 @@ test "int" {
 }
 
 test "float" {
-    @setEvalBranchQuota(2000);
+    @setEvalBranchQuota(3000);
 
     // normal -> normal
     try expect(nextAfter(f16, 0x1.234p0, 2.0) == 0x1.238p0);

src/Sema.zig

@@ -7423,10 +7423,12 @@ fn analyzeCall(
 
     var is_generic_call = func_ty_info.is_generic;
     var is_comptime_call = block.is_comptime or modifier == .compile_time;
+    var is_inline_call = is_comptime_call or modifier == .always_inline or func_ty_info.cc == .Inline;
     var comptime_reason: ?*const Block.ComptimeReason = null;
-    if (!is_comptime_call) {
+    if (!is_inline_call and !is_comptime_call) {
         if (sema.typeRequiresComptime(Type.fromInterned(func_ty_info.return_type))) |ct| {
             is_comptime_call = ct;
+            is_inline_call = ct;
             if (ct) {
                 comptime_reason = &.{ .comptime_ret_ty = .{
                     .block = block,
@@ -7440,8 +7442,6 @@ fn analyzeCall(
             else => |e| return e,
         }
     }
-    var is_inline_call = is_comptime_call or modifier == .always_inline or
-        func_ty_info.cc == .Inline;
 
     if (sema.func_is_naked and !is_inline_call and !is_comptime_call) {
         const msg = msg: {

test/behavior/fn.zig

@@ -605,3 +605,17 @@ test "comptime parameters don't have to be marked comptime if only called at com
     };
     comptime std.debug.assert(S.foo(5, 6) == 11);
 }
+
+test "inline function with comptime-known comptime-only return type called at runtime" {
+    const S = struct {
+        inline fn foo(x: *i32, y: *const i32) type {
+            x.* = y.*;
+            return f32;
+        }
+    };
+    var a: i32 = 0;
+    const b: i32 = 111;
+    const T = S.foo(&a, &b);
+    try expectEqual(111, a);
+    try expectEqual(f32, T);
+}