Index: Python/ast.c
===================================================================
--- Python/ast.c	(revision 66821)
+++ Python/ast.c	(working copy)
@@ -3160,9 +3160,6 @@
     if (encoding == NULL) {
         buf = (char *)s;
         u = NULL;
-    } else if (strcmp(encoding, "iso-8859-1") == 0) {
-        buf = (char *)s;
-        u = NULL;
     } else {
         /* check for integer overflow */
         if (len > PY_SIZE_MAX / 4)
@@ -3275,8 +3272,7 @@
         }
     }
     need_encoding = (!*bytesmode && c->c_encoding != NULL &&
-                     strcmp(c->c_encoding, "utf-8") != 0 &&
-                     strcmp(c->c_encoding, "iso-8859-1") != 0);
+                     strcmp(c->c_encoding, "utf-8") != 0);
     if (rawmode || strchr(s, '\\') == NULL) {
         if (need_encoding) {
             PyObject *v, *u = PyUnicode_DecodeUTF8(s, len, NULL);
Index: Parser/tokenizer.c
===================================================================
--- Parser/tokenizer.c	(revision 66821)
+++ Parser/tokenizer.c	(working copy)
@@ -135,6 +135,7 @@
 	tok->decoding_state = STATE_INIT;
 	tok->decoding_erred = 0;
 	tok->read_coding_spec = 0;
+	tok->enc = NULL;
 	tok->encoding = NULL;
         tok->cont_line = 0;
 #ifndef PGEN
@@ -274,8 +275,7 @@
 		tok->read_coding_spec = 1;
 		if (tok->encoding == NULL) {
 			assert(tok->decoding_state == STATE_RAW);
-			if (strcmp(cs, "utf-8") == 0 ||
-			    strcmp(cs, "iso-8859-1") == 0) {
+			if (strcmp(cs, "utf-8") == 0) {
 				tok->encoding = cs;
 			} else {
 				r = set_readline(tok, cs);
Index: Parser/tokenizer.h
===================================================================
--- Parser/tokenizer.h	(revision 66821)
+++ Parser/tokenizer.h	(working copy)
@@ -49,14 +49,14 @@
 	enum decoding_state decoding_state;
 	int decoding_erred;	/* whether erred in decoding  */
 	int read_coding_spec;	/* whether 'coding:...' has been read  */
-	char *encoding;
+	char *encoding;         /* Source encoding. */
 	int cont_line;          /* whether we are in a continuation line. */
 	const char* line_start;	/* pointer to start of current line */
 #ifndef PGEN
 	PyObject *decoding_readline; /* codecs.open(...).readline */
 	PyObject *decoding_buffer;
 #endif
-	const char* enc;
+	const char* enc;        /* Encoding for the current str. */
 	const char* str;
 };
 
Index: Lib/test/test_pep3120.py
===================================================================
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