Sema: improve panic for slice start index being greater than end index

Closes #13689

1 files changed, 8 insertions, 3 deletions

diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index 1f7d48ccb9..09833988ae 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -863,10 +863,9 @@ pub fn panicOutOfBounds(index: usize, len: usize) noreturn {
     std.debug.panicExtra(null, @returnAddress(), "index out of bounds: index {d}, len {d}", .{ index, len });
 }
 
-pub noinline fn returnError(st: *StackTrace) void {
+pub fn panicStartGreaterThanEnd(start: usize, end: usize) noreturn {
     @setCold(true);
-    @setRuntimeSafety(false);
-    addErrRetTraceAddr(st, @returnAddress());
+    std.debug.panicExtra(null, @returnAddress(), "start index {d} is larger than end index {d}", .{ start, end });
 }
 
 pub const panic_messages = struct {
@@ -889,6 +888,12 @@ pub const panic_messages = struct {
     pub const invalid_enum_value = "invalid enum value";
 };
 
+pub noinline fn returnError(st: *StackTrace) void {
+    @setCold(true);
+    @setRuntimeSafety(false);
+    addErrRetTraceAddr(st, @returnAddress());
+}
+
 pub inline fn addErrRetTraceAddr(st: *StackTrace, addr: usize) void {
     if (st.index < st.instruction_addresses.len)
         st.instruction_addresses[st.index] = addr;