diff --git a/release/c/wuffs-unsupported-snapshot.c b/release/c/wuffs-unsupported-snapshot.c
index debb131..56708cb 100644
--- a/release/c/wuffs-unsupported-snapshot.c
+++ b/release/c/wuffs-unsupported-snapshot.c
@@ -3053,7 +3053,7 @@
     uint32_t magic;
     uint32_t active_coroutine;
 
-    uint32_t f_lw;
+    uint32_t f_set_literal_width_arg;
     uint32_t f_literal_width;
     uint32_t f_clear_code;
     uint32_t f_end_code;
@@ -8039,7 +8039,7 @@
     return ((wuffs_base__empty_struct){});
   }
 
-  self->private_impl.f_lw = a_lw;
+  self->private_impl.f_set_literal_width_arg = a_lw;
   return ((wuffs_base__empty_struct){});
 }
 
@@ -8089,8 +8089,9 @@
     WUFFS_BASE__COROUTINE_SUSPENSION_POINT_0;
 
     self->private_impl.f_literal_width = 8;
-    if (self->private_impl.f_lw >= 2) {
-      self->private_impl.f_literal_width = self->private_impl.f_lw;
+    if (self->private_impl.f_set_literal_width_arg >= 2) {
+      self->private_impl.f_literal_width =
+          self->private_impl.f_set_literal_width_arg;
     }
     self->private_impl.f_clear_code =
         (((uint32_t)(1)) << self->private_impl.f_literal_width);
diff --git a/std/lzw/decode_lzw.wuffs b/std/lzw/decode_lzw.wuffs
index d1aebb8..4e2eb35 100644
--- a/std/lzw/decode_lzw.wuffs
+++ b/std/lzw/decode_lzw.wuffs
@@ -27,10 +27,11 @@
 pub const decoder_workbuf_len_max_incl_worst_case base.u64 = 0
 
 pub struct decoder?(
-	// The value passed to set_literal_width. This lw field is copied to the
-	// literal_width field at the start of the decode method. During that
-	// method, calling set_literal_width will change lw but not literal_width.
-	lw base.u32[..8],
+	// set_literal_width_arg is the saved argument passed to set_literal_width.
+	// This field is copied to the literal_width field at the start of
+	// decode_io_writer. During that method, calling set_literal_width will
+	// change set_literal_width_arg but not literal_width.
+	set_literal_width_arg base.u32[..8],
 
 	// read_from state that does not change during a decode call.
 	literal_width base.u32[..8],
@@ -67,7 +68,7 @@
 )
 
 pub func decoder.set_literal_width!(lw base.u32[2..8]) {
-	this.lw = args.lw
+	this.set_literal_width_arg = args.lw
 }
 
 pub func decoder.workbuf_len() base.range_ii_u64 {
@@ -79,8 +80,8 @@
 
 	// Initialize read_from state.
 	this.literal_width = 8
-	if this.lw >= 2 {
-		this.literal_width = this.lw
+	if this.set_literal_width_arg >= 2 {
+		this.literal_width = this.set_literal_width_arg
 	}
 	this.clear_code = (1 as base.u32) << this.literal_width
 	this.end_code = this.clear_code + 1