weak contextual string-literal inference

compiler/checker/checker.odin

@@ -2804,9 +2804,9 @@ infer_call_comptime_values :: proc(
 	for value_bound in bound {
 		all_bound = all_bound && value_bound
 	}
-	// Concrete arguments bind first. Numeric constants and `null` are contextual and
-	// therefore only contribute after stronger evidence has had a chance to bind the
-	// parameter type.
+	// Concrete arguments bind first. Numeric constants, string literals, and `null`
+	// are contextual and therefore only contribute after stronger evidence has had a
+	// chance to bind the parameter type.
 	weak_passes := [2]bool{false, true}
 	for weak in weak_passes {
 		for arg_id, source_index in args {
@@ -2819,7 +2819,8 @@ infer_call_comptime_values :: proc(
 			}
 			arg_expr := checker.ast_module.exprs[arg_id]
 			is_null := arg_expr.kind == .Null
-			is_weak := is_numeric_constant_expr(checker, arg_id) || is_null
+			is_weak := is_numeric_constant_expr(checker, arg_id) ||
+			           arg_expr.kind == .String || is_null
 			if is_weak != weak {
 				continue
 			}