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-rw-r--r--src/libexpr/lexer.l1
-rw-r--r--src/libexpr/parser.y4
2 files changed, 4 insertions, 1 deletions
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 5db13a716..df30a5ed0 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -91,6 +91,7 @@ else { return ELSE; }
assert { return ASSERT; }
with { return WITH; }
let { return LET; }
+in { return IN; }
rec { return REC; }
inherit { return INHERIT; }
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index e4b220e04..f5c3435e5 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -123,7 +123,7 @@ static void freeAndUnprotect(void * p)
%type <t> expr_app expr_select expr_simple bind inheritsrc formal
%type <ts> binds ids expr_list formals string_parts
%token <t> ID INT STR PATH URI
-%token IF THEN ELSE ASSERT WITH LET REC INHERIT EQ NEQ AND OR IMPL
+%token IF THEN ELSE ASSERT WITH LET IN REC INHERIT EQ NEQ AND OR IMPL
%token DOLLAR_CURLY /* == ${ */
%nonassoc IMPL
@@ -152,6 +152,8 @@ expr_function
{ $$ = makeAssert($2, $4, CUR_POS); }
| WITH expr ';' expr_function
{ $$ = makeWith($2, $4, CUR_POS); }
+ | LET binds IN expr_function
+ { $$ = makeSelect(fixAttrs(1, ATinsert($2, makeBind(toATerm("<let-body>"), $4, CUR_POS))), toATerm("<let-body>")); }
| expr_if
;