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doc/manual/src/expressions/language-constructs.md

@@ -1,5 +1,7 @@
 # Language Constructs
 
+## Recursive sets
+
 Recursive sets are just normal sets, but the attributes can refer to
 each other. For example,
 
@@ -24,6 +26,8 @@ example,
 
 does not terminate\[1\].
 
+## Let-expressions
+
 A let-expression allows you to define local variables for an expression.
 For instance,
 
@@ -34,6 +38,8 @@ For instance,
 
 evaluates to `"foobar"`.
 
+## Inheriting attributes
+
 When defining a set or in a let-expression it is often convenient to
 copy variables from the surrounding lexical scope (e.g., when you want
 to propagate attributes). This can be shortened using the `inherit`
@@ -95,6 +101,8 @@ is equivalent to
 when used while defining local variables in a let-expression or while
 defining a set.
 
+## Functions
+
 Functions have the following form:
 
     pattern: body
@@ -187,6 +195,8 @@ you can bind them to an attribute, e.g.,
     let concat = { x, y }: x + y;
     in concat { x = "foo"; y = "bar"; }
 
+## Conditionals
+
 Conditionals look like this:
 
     if e1 then e2 else e3
@@ -194,6 +204,8 @@ Conditionals look like this:
 where e1 is an expression that should evaluate to a Boolean value
 (`true` or `false`).
 
+## Assertions
+
 Assertions are generally used to check that certain requirements on or
 between features and dependencies hold. They look like this:
 
@@ -257,6 +269,8 @@ The points of interest are:
     non-`null` value was passed. This prevents an unnecessary rebuild of
     Subversion if OpenSSL changes.
 
+## With-expressions
+
 A *with-expression*,
 
     with e1; e2
@@ -285,6 +299,8 @@ establishes the same scope as
 
     let a = 1; in let a = 2; in let a = 3; in let a = 4; in ...
 
+## Comments
+
 Comments can be single-line, started with a `#` character, or
 inline/multi-line, enclosed within `/*
 ... */`.