File 3507-cover-Implement-support-for-maybe-.-end.patch of Package erlang

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File 3507-cover-Implement-support-for-maybe-.-end.patch of Package erlang (Revision 3c9c0418baf827024777fc45d8229550)

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From daefc0a33e36498b5401badfc0cad6bc8a6a317e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Tue, 9 Nov 2021 10:08:17 +0100
Subject: [PATCH 07/12] cover: Implement support for maybe ... end

---
 lib/tools/src/cover.erl        | 12 +++++++
 lib/tools/test/cover_SUITE.erl | 61 +++++++++++++++++++++++++++++++++-
 2 files changed, 72 insertions(+), 1 deletion(-)

diff --git a/lib/tools/src/cover.erl b/lib/tools/src/cover.erl
index a09f6f73de..27006199d1 100644
--- a/lib/tools/src/cover.erl
+++ b/lib/tools/src/cover.erl
@@ -336,6 +336,7 @@ filter_options(Options) ->
                              {d, _Macro, _Value} -> true;
                              export_all -> true;
                              tuple_calls -> true;
+                             {enable_feature,_} -> true; %FIXME: To be removed.
                              _ -> false
                          end
                  end,
@@ -2169,6 +2170,10 @@ munge_expr({match,Anno,ExprL,ExprR}, Vars) ->
     {MungedExprL, Vars2} = munge_expr(ExprL, Vars),
     {MungedExprR, Vars3} = munge_expr(ExprR, Vars2),
     {{match,Anno,MungedExprL,MungedExprR}, Vars3};
+munge_expr({maybe_match,Anno,ExprL,ExprR}, Vars) ->
+    {MungedExprL, Vars2} = munge_expr(ExprL, Vars),
+    {MungedExprR, Vars3} = munge_expr(ExprR, Vars2),
+    {{maybe_match,Anno,MungedExprL,MungedExprR}, Vars3};
 munge_expr({tuple,Anno,Exprs}, Vars) ->
     {MungedExprs, Vars2} = munge_exprs(Exprs, Vars, []),
     {{tuple,Anno,MungedExprs}, Vars2};
@@ -2260,6 +2265,13 @@ munge_expr({'try',Anno,Body,Clauses,CatchClauses,After}, Vars) ->
     {MungedAfter, Vars4} = munge_body(After, Vars3),
     {{'try',Anno,MungedBody,MungedClauses,MungedCatchClauses,MungedAfter},
      Vars4};
+munge_expr({'maybe',Anno,Exprs}, Vars) ->
+    {MungedExprs, Vars2} = munge_body(Exprs, Vars),
+    {{'maybe',Anno,MungedExprs}, Vars2};
+munge_expr({'maybe',MaybeAnno,Exprs,{'else',ElseAnno,Clauses}}, Vars) ->
+    {MungedExprs, Vars2} = munge_body(Exprs, Vars),
+    {MungedClauses, Vars3} = munge_clauses(Clauses, Vars2),
+    {{'maybe',MaybeAnno,MungedExprs,{'else',ElseAnno,MungedClauses}}, Vars3};
 munge_expr({'fun',Anno,{clauses,Clauses}}, Vars) ->
     {MungedClauses,Vars2}=munge_clauses(Clauses, Vars),
     {{'fun',Anno,{clauses,MungedClauses}}, Vars2};
diff --git a/lib/tools/test/cover_SUITE.erl b/lib/tools/test/cover_SUITE.erl
index 19550455db..9a2479bd94 100644
--- a/lib/tools/test/cover_SUITE.erl
+++ b/lib/tools/test/cover_SUITE.erl
@@ -32,7 +32,8 @@ all() ->
                    otp_8340,otp_8188,compile_beam_opts,eep37,
                    analyse_no_beam, line_0, compile_beam_no_file,
                    compile_beam_missing_backend,
-                   otp_13277, otp_13289, guard_in_lc, gh_4796],
+                   otp_13277, otp_13289, guard_in_lc, gh_4796,
+                   eep49],
     StartStop = [start, compile, analyse, misc, stop,
                  distribution, reconnect, die_and_reconnect,
                  dont_reconnect_after_stop, stop_node_after_disconnect,
@@ -1895,6 +1896,64 @@ gh_4796(Config) ->
     ok = file:delete(File),
     ok = gh_4796:test().
 
+%% Test the maybe ... else ... end construct.
+eep49(Config) ->
+        ok = file:set_cwd(proplists:get_value(priv_dir, Config)),
+
+    File = "t.erl",
+    Test = <<"-module(t).
+              -export([t/0]).
+              -compile([{enable_feature,'maybe'}]).
+
+              t() ->
+                  t1(),                         %6
+
+                  {a,b} = t2({ok,a}, {ok,b}),   %8
+                  error = t2({ok,a}, error),    %9
+                  whatever = t2(whatever, thing), %10
+
+                  {a,b} = t3({ok,a}, {ok,b}),   %12
+                  error = t3({ok,a}, {error,wrong}), %13
+                  {'EXIT',{{else_clause,whatever},_}} = catch t3(whatever, thing), %14
+
+                  ok.                           %16
+
+              t1() ->
+                  maybe                         %19
+                       ok                       %20
+                  end.
+
+              t2(X, Y) ->
+                  maybe                         %24
+                      {ok,A} ?= X,              %25
+                      {ok,B} ?= Y,              %26
+                      {A,B}                     %27
+                  end.
+
+              t3(X, Y) ->
+                  maybe                         %31
+                      {ok,A} ?= X,              %32
+                      {ok,B} ?= Y,              %33
+                      {A,B}                     %34
+                  else
+                      {error,_} ->
+                          error                 %37
+                  end.
+             ">>,
+    ok = file:write_file(File, Test),
+    %% FIXME: Remove `enable_feature` option here when it can be recognized inside a module.
+    {ok, t} = cover:compile(File, [{enable_feature,maybe_expr}]),
+    ok = t:t(),
+    {ok,[{{t,6},1}, {{t,8},1}, {{t,9},1}, {{t,10},1}, {{t,12},1},
+         {{t,13},1}, {{t,14},1}, {{t,16},1},
+         {{t,19},1}, {{t,20},1},
+         {{t,24},3}, {{t,25},3}, {{t,26},2}, {{t,27},1},
+         {{t,31},3}, {{t,32},3}, {{t,33},2}, {{t,34},1}, {{t,37},1}
+        ]} = cover:analyse(t, calls, line),
+    ok = file:delete(File),
+    ok.
+
+
 %%--Auxiliary------------------------------------------------------------
 
 analyse_expr(Expr, Config) ->
-- 
2.34.1

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